1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 2ac27a0ecSDave Kleikamp /* 3617ba13bSMingming Cao * linux/fs/ext4/xattr.c 4ac27a0ecSDave Kleikamp * 5ac27a0ecSDave Kleikamp * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> 6ac27a0ecSDave Kleikamp * 7ac27a0ecSDave Kleikamp * Fix by Harrison Xing <harrison@mountainviewdata.com>. 8617ba13bSMingming Cao * Ext4 code with a lot of help from Eric Jarman <ejarman@acm.org>. 9ac27a0ecSDave Kleikamp * Extended attributes for symlinks and special files added per 10ac27a0ecSDave Kleikamp * suggestion of Luka Renko <luka.renko@hermes.si>. 11ac27a0ecSDave Kleikamp * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, 12ac27a0ecSDave Kleikamp * Red Hat Inc. 13ac27a0ecSDave Kleikamp * ea-in-inode support by Alex Tomas <alex@clusterfs.com> aka bzzz 14ac27a0ecSDave Kleikamp * and Andreas Gruenbacher <agruen@suse.de>. 15ac27a0ecSDave Kleikamp */ 16ac27a0ecSDave Kleikamp 17ac27a0ecSDave Kleikamp /* 18ac27a0ecSDave Kleikamp * Extended attributes are stored directly in inodes (on file systems with 19ac27a0ecSDave Kleikamp * inodes bigger than 128 bytes) and on additional disk blocks. The i_file_acl 20ac27a0ecSDave Kleikamp * field contains the block number if an inode uses an additional block. All 21ac27a0ecSDave Kleikamp * attributes must fit in the inode and one additional block. Blocks that 22ac27a0ecSDave Kleikamp * contain the identical set of attributes may be shared among several inodes. 23ac27a0ecSDave Kleikamp * Identical blocks are detected by keeping a cache of blocks that have 24ac27a0ecSDave Kleikamp * recently been accessed. 25ac27a0ecSDave Kleikamp * 26ac27a0ecSDave Kleikamp * The attributes in inodes and on blocks have a different header; the entries 27ac27a0ecSDave Kleikamp * are stored in the same format: 28ac27a0ecSDave Kleikamp * 29ac27a0ecSDave Kleikamp * +------------------+ 30ac27a0ecSDave Kleikamp * | header | 31ac27a0ecSDave Kleikamp * | entry 1 | | 32ac27a0ecSDave Kleikamp * | entry 2 | | growing downwards 33ac27a0ecSDave Kleikamp * | entry 3 | v 34ac27a0ecSDave Kleikamp * | four null bytes | 35ac27a0ecSDave Kleikamp * | . . . | 36ac27a0ecSDave Kleikamp * | value 1 | ^ 37ac27a0ecSDave Kleikamp * | value 3 | | growing upwards 38ac27a0ecSDave Kleikamp * | value 2 | | 39ac27a0ecSDave Kleikamp * +------------------+ 40ac27a0ecSDave Kleikamp * 41ac27a0ecSDave Kleikamp * The header is followed by multiple entry descriptors. In disk blocks, the 42ac27a0ecSDave Kleikamp * entry descriptors are kept sorted. In inodes, they are unsorted. The 43ac27a0ecSDave Kleikamp * attribute values are aligned to the end of the block in no specific order. 44ac27a0ecSDave Kleikamp * 45ac27a0ecSDave Kleikamp * Locking strategy 46ac27a0ecSDave Kleikamp * ---------------- 47617ba13bSMingming Cao * EXT4_I(inode)->i_file_acl is protected by EXT4_I(inode)->xattr_sem. 48ac27a0ecSDave Kleikamp * EA blocks are only changed if they are exclusive to an inode, so 49ac27a0ecSDave Kleikamp * holding xattr_sem also means that nothing but the EA block's reference 50ac27a0ecSDave Kleikamp * count can change. Multiple writers to the same block are synchronized 51ac27a0ecSDave Kleikamp * by the buffer lock. 52ac27a0ecSDave Kleikamp */ 53ac27a0ecSDave Kleikamp 54ac27a0ecSDave Kleikamp #include <linux/init.h> 55ac27a0ecSDave Kleikamp #include <linux/fs.h> 56ac27a0ecSDave Kleikamp #include <linux/slab.h> 577a2508e1SJan Kara #include <linux/mbcache.h> 58ac27a0ecSDave Kleikamp #include <linux/quotaops.h> 59ee73f9a5SJeff Layton #include <linux/iversion.h> 603dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 613dcf5451SChristoph Hellwig #include "ext4.h" 62ac27a0ecSDave Kleikamp #include "xattr.h" 63ac27a0ecSDave Kleikamp #include "acl.h" 64ac27a0ecSDave Kleikamp 65617ba13bSMingming Cao #ifdef EXT4_XATTR_DEBUG 66d74f3d25SJoe Perches # define ea_idebug(inode, fmt, ...) \ 67d74f3d25SJoe Perches printk(KERN_DEBUG "inode %s:%lu: " fmt "\n", \ 68d74f3d25SJoe Perches inode->i_sb->s_id, inode->i_ino, ##__VA_ARGS__) 69d74f3d25SJoe Perches # define ea_bdebug(bh, fmt, ...) \ 70d74f3d25SJoe Perches printk(KERN_DEBUG "block %pg:%lu: " fmt "\n", \ 71d74f3d25SJoe Perches bh->b_bdev, (unsigned long)bh->b_blocknr, ##__VA_ARGS__) 72ac27a0ecSDave Kleikamp #else 73ace36ad4SJoe Perches # define ea_idebug(inode, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 74ace36ad4SJoe Perches # define ea_bdebug(bh, fmt, ...) no_printk(fmt, ##__VA_ARGS__) 75ac27a0ecSDave Kleikamp #endif 76ac27a0ecSDave Kleikamp 7747387409STahsin Erdogan static void ext4_xattr_block_cache_insert(struct mb_cache *, 7847387409STahsin Erdogan struct buffer_head *); 7947387409STahsin Erdogan static struct buffer_head * 8047387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *, struct ext4_xattr_header *, 817a2508e1SJan Kara struct mb_cache_entry **); 82b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 83b9fc761eSTahsin Erdogan size_t value_count); 84f3bbac32SLinus Torvalds static __le32 ext4_xattr_hash_entry_signed(char *name, size_t name_len, __le32 *value, 85f3bbac32SLinus Torvalds size_t value_count); 86daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *); 87ac27a0ecSDave Kleikamp 88d6006186SEric Biggers static const struct xattr_handler * const ext4_xattr_handler_map[] = { 89617ba13bSMingming Cao [EXT4_XATTR_INDEX_USER] = &ext4_xattr_user_handler, 9003010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 9164e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, 9264e178a7SChristoph Hellwig [EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, 93ac27a0ecSDave Kleikamp #endif 94617ba13bSMingming Cao [EXT4_XATTR_INDEX_TRUSTED] = &ext4_xattr_trusted_handler, 9503010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 96617ba13bSMingming Cao [EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler, 97ac27a0ecSDave Kleikamp #endif 9888ee9d57SJan (janneke) Nieuwenhuizen [EXT4_XATTR_INDEX_HURD] = &ext4_xattr_hurd_handler, 99ac27a0ecSDave Kleikamp }; 100ac27a0ecSDave Kleikamp 10111e27528SStephen Hemminger const struct xattr_handler *ext4_xattr_handlers[] = { 102617ba13bSMingming Cao &ext4_xattr_user_handler, 103617ba13bSMingming Cao &ext4_xattr_trusted_handler, 10403010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 10564e178a7SChristoph Hellwig &posix_acl_access_xattr_handler, 10664e178a7SChristoph Hellwig &posix_acl_default_xattr_handler, 107ac27a0ecSDave Kleikamp #endif 10803010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_SECURITY 109617ba13bSMingming Cao &ext4_xattr_security_handler, 110ac27a0ecSDave Kleikamp #endif 11188ee9d57SJan (janneke) Nieuwenhuizen &ext4_xattr_hurd_handler, 112ac27a0ecSDave Kleikamp NULL 113ac27a0ecSDave Kleikamp }; 114ac27a0ecSDave Kleikamp 11547387409STahsin Erdogan #define EA_BLOCK_CACHE(inode) (((struct ext4_sb_info *) \ 11647387409STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_block_cache) 1179c191f70ST Makphaibulchoke 118dec214d0STahsin Erdogan #define EA_INODE_CACHE(inode) (((struct ext4_sb_info *) \ 119dec214d0STahsin Erdogan inode->i_sb->s_fs_info)->s_ea_inode_cache) 120dec214d0STahsin Erdogan 12130a7eb97STahsin Erdogan static int 12230a7eb97STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 12330a7eb97STahsin Erdogan struct inode *inode); 12430a7eb97STahsin Erdogan 12533d201e0STahsin Erdogan #ifdef CONFIG_LOCKDEP 12633d201e0STahsin Erdogan void ext4_xattr_inode_set_class(struct inode *ea_inode) 12733d201e0STahsin Erdogan { 12833d201e0STahsin Erdogan lockdep_set_subclass(&ea_inode->i_rwsem, 1); 12933d201e0STahsin Erdogan } 13033d201e0STahsin Erdogan #endif 13133d201e0STahsin Erdogan 132cc8e94fdSDarrick J. Wong static __le32 ext4_xattr_block_csum(struct inode *inode, 133cc8e94fdSDarrick J. Wong sector_t block_nr, 134cc8e94fdSDarrick J. Wong struct ext4_xattr_header *hdr) 135cc8e94fdSDarrick J. Wong { 136cc8e94fdSDarrick J. Wong struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 137d6a77105STheodore Ts'o __u32 csum; 138d6a77105STheodore Ts'o __le64 dsk_block_nr = cpu_to_le64(block_nr); 139b47820edSDaeho Jeong __u32 dummy_csum = 0; 140b47820edSDaeho Jeong int offset = offsetof(struct ext4_xattr_header, h_checksum); 141cc8e94fdSDarrick J. Wong 142d6a77105STheodore Ts'o csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&dsk_block_nr, 143d6a77105STheodore Ts'o sizeof(dsk_block_nr)); 144b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr, offset); 145b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum)); 146b47820edSDaeho Jeong offset += sizeof(dummy_csum); 147b47820edSDaeho Jeong csum = ext4_chksum(sbi, csum, (__u8 *)hdr + offset, 148b47820edSDaeho Jeong EXT4_BLOCK_SIZE(inode->i_sb) - offset); 14941eb70ddSTao Ma 150cc8e94fdSDarrick J. Wong return cpu_to_le32(csum); 151cc8e94fdSDarrick J. Wong } 152cc8e94fdSDarrick J. Wong 153cc8e94fdSDarrick J. Wong static int ext4_xattr_block_csum_verify(struct inode *inode, 154dac7a4b4STheodore Ts'o struct buffer_head *bh) 155cc8e94fdSDarrick J. Wong { 156dac7a4b4STheodore Ts'o struct ext4_xattr_header *hdr = BHDR(bh); 157dac7a4b4STheodore Ts'o int ret = 1; 158dac7a4b4STheodore Ts'o 159dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) { 160dac7a4b4STheodore Ts'o lock_buffer(bh); 161dac7a4b4STheodore Ts'o ret = (hdr->h_checksum == ext4_xattr_block_csum(inode, 162dac7a4b4STheodore Ts'o bh->b_blocknr, hdr)); 163dac7a4b4STheodore Ts'o unlock_buffer(bh); 164dac7a4b4STheodore Ts'o } 165dac7a4b4STheodore Ts'o return ret; 166cc8e94fdSDarrick J. Wong } 167cc8e94fdSDarrick J. Wong 168cc8e94fdSDarrick J. Wong static void ext4_xattr_block_csum_set(struct inode *inode, 169cc8e94fdSDarrick J. Wong struct buffer_head *bh) 170cc8e94fdSDarrick J. Wong { 171dac7a4b4STheodore Ts'o if (ext4_has_metadata_csum(inode->i_sb)) 172dac7a4b4STheodore Ts'o BHDR(bh)->h_checksum = ext4_xattr_block_csum(inode, 173dac7a4b4STheodore Ts'o bh->b_blocknr, BHDR(bh)); 174cc8e94fdSDarrick J. Wong } 175cc8e94fdSDarrick J. Wong 17611e27528SStephen Hemminger static inline const struct xattr_handler * 177617ba13bSMingming Cao ext4_xattr_handler(int name_index) 178ac27a0ecSDave Kleikamp { 17911e27528SStephen Hemminger const struct xattr_handler *handler = NULL; 180ac27a0ecSDave Kleikamp 181617ba13bSMingming Cao if (name_index > 0 && name_index < ARRAY_SIZE(ext4_xattr_handler_map)) 182617ba13bSMingming Cao handler = ext4_xattr_handler_map[name_index]; 183ac27a0ecSDave Kleikamp return handler; 184ac27a0ecSDave Kleikamp } 185ac27a0ecSDave Kleikamp 186ac27a0ecSDave Kleikamp static int 1873478c83cSTheodore Ts'o check_xattrs(struct inode *inode, struct buffer_head *bh, 1883478c83cSTheodore Ts'o struct ext4_xattr_entry *entry, void *end, void *value_start, 1893478c83cSTheodore Ts'o const char *function, unsigned int line) 190ac27a0ecSDave Kleikamp { 191a0626e75SDarrick J. Wong struct ext4_xattr_entry *e = entry; 1923478c83cSTheodore Ts'o int err = -EFSCORRUPTED; 1933478c83cSTheodore Ts'o char *err_str; 1943478c83cSTheodore Ts'o 1953478c83cSTheodore Ts'o if (bh) { 1963478c83cSTheodore Ts'o if (BHDR(bh)->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC) || 1973478c83cSTheodore Ts'o BHDR(bh)->h_blocks != cpu_to_le32(1)) { 1983478c83cSTheodore Ts'o err_str = "invalid header"; 1993478c83cSTheodore Ts'o goto errout; 2003478c83cSTheodore Ts'o } 2013478c83cSTheodore Ts'o if (buffer_verified(bh)) 2023478c83cSTheodore Ts'o return 0; 2033478c83cSTheodore Ts'o if (!ext4_xattr_block_csum_verify(inode, bh)) { 2043478c83cSTheodore Ts'o err = -EFSBADCRC; 2053478c83cSTheodore Ts'o err_str = "invalid checksum"; 2063478c83cSTheodore Ts'o goto errout; 2073478c83cSTheodore Ts'o } 2083478c83cSTheodore Ts'o } else { 2093478c83cSTheodore Ts'o struct ext4_xattr_ibody_header *header = value_start; 2103478c83cSTheodore Ts'o 2113478c83cSTheodore Ts'o header -= 1; 2123478c83cSTheodore Ts'o if (end - (void *)header < sizeof(*header) + sizeof(u32)) { 2133478c83cSTheodore Ts'o err_str = "in-inode xattr block too small"; 2143478c83cSTheodore Ts'o goto errout; 2153478c83cSTheodore Ts'o } 2163478c83cSTheodore Ts'o if (header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)) { 2173478c83cSTheodore Ts'o err_str = "bad magic number in in-inode xattr"; 2183478c83cSTheodore Ts'o goto errout; 2193478c83cSTheodore Ts'o } 2203478c83cSTheodore Ts'o } 221a0626e75SDarrick J. Wong 222d7614cc1SEric Biggers /* Find the end of the names list */ 223a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(e)) { 224a0626e75SDarrick J. Wong struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e); 2253478c83cSTheodore Ts'o if ((void *)next >= end) { 2263478c83cSTheodore Ts'o err_str = "e_name out of bounds"; 2273478c83cSTheodore Ts'o goto errout; 2283478c83cSTheodore Ts'o } 2293478c83cSTheodore Ts'o if (strnlen(e->e_name, e->e_name_len) != e->e_name_len) { 2303478c83cSTheodore Ts'o err_str = "bad e_name length"; 2313478c83cSTheodore Ts'o goto errout; 2323478c83cSTheodore Ts'o } 233a0626e75SDarrick J. Wong e = next; 234ac27a0ecSDave Kleikamp } 235a0626e75SDarrick J. Wong 236d7614cc1SEric Biggers /* Check the values */ 237a0626e75SDarrick J. Wong while (!IS_LAST_ENTRY(entry)) { 238d7614cc1SEric Biggers u32 size = le32_to_cpu(entry->e_value_size); 2393478c83cSTheodore Ts'o unsigned long ea_ino = le32_to_cpu(entry->e_value_inum); 240ce3fd194SEric Biggers 2413478c83cSTheodore Ts'o if (!ext4_has_feature_ea_inode(inode->i_sb) && ea_ino) { 2423478c83cSTheodore Ts'o err_str = "ea_inode specified without ea_inode feature enabled"; 2433478c83cSTheodore Ts'o goto errout; 2443478c83cSTheodore Ts'o } 2453478c83cSTheodore Ts'o if (ea_ino && ((ea_ino == EXT4_ROOT_INO) || 2463478c83cSTheodore Ts'o !ext4_valid_inum(inode->i_sb, ea_ino))) { 2473478c83cSTheodore Ts'o err_str = "invalid ea_ino"; 2483478c83cSTheodore Ts'o goto errout; 2493478c83cSTheodore Ts'o } 2503478c83cSTheodore Ts'o if (size > EXT4_XATTR_SIZE_MAX) { 2513478c83cSTheodore Ts'o err_str = "e_value size too large"; 2523478c83cSTheodore Ts'o goto errout; 2533478c83cSTheodore Ts'o } 254ce3fd194SEric Biggers 255ce3fd194SEric Biggers if (size != 0 && entry->e_value_inum == 0) { 256ce3fd194SEric Biggers u16 offs = le16_to_cpu(entry->e_value_offs); 257d7614cc1SEric Biggers void *value; 258d7614cc1SEric Biggers 259d7614cc1SEric Biggers /* 260d7614cc1SEric Biggers * The value cannot overlap the names, and the value 261d7614cc1SEric Biggers * with padding cannot extend beyond 'end'. Check both 262d7614cc1SEric Biggers * the padded and unpadded sizes, since the size may 263d7614cc1SEric Biggers * overflow to 0 when adding padding. 264d7614cc1SEric Biggers */ 2653478c83cSTheodore Ts'o if (offs > end - value_start) { 2663478c83cSTheodore Ts'o err_str = "e_value out of bounds"; 2673478c83cSTheodore Ts'o goto errout; 2683478c83cSTheodore Ts'o } 269d7614cc1SEric Biggers value = value_start + offs; 270d7614cc1SEric Biggers if (value < (void *)e + sizeof(u32) || 271d7614cc1SEric Biggers size > end - value || 2723478c83cSTheodore Ts'o EXT4_XATTR_SIZE(size) > end - value) { 2733478c83cSTheodore Ts'o err_str = "overlapping e_value "; 2743478c83cSTheodore Ts'o goto errout; 2753478c83cSTheodore Ts'o } 276d7614cc1SEric Biggers } 277a0626e75SDarrick J. Wong entry = EXT4_XATTR_NEXT(entry); 278a0626e75SDarrick J. Wong } 2793478c83cSTheodore Ts'o if (bh) 2803478c83cSTheodore Ts'o set_buffer_verified(bh); 281ac27a0ecSDave Kleikamp return 0; 2823478c83cSTheodore Ts'o 2833478c83cSTheodore Ts'o errout: 2843478c83cSTheodore Ts'o if (bh) 2853478c83cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, -err, 2863478c83cSTheodore Ts'o "corrupted xattr block %llu: %s", 2873478c83cSTheodore Ts'o (unsigned long long) bh->b_blocknr, 2883478c83cSTheodore Ts'o err_str); 2893478c83cSTheodore Ts'o else 2903478c83cSTheodore Ts'o __ext4_error_inode(inode, function, line, 0, -err, 2913478c83cSTheodore Ts'o "corrupted in-inode xattr: %s", err_str); 2923478c83cSTheodore Ts'o return err; 293ac27a0ecSDave Kleikamp } 294ac27a0ecSDave Kleikamp 295ac27a0ecSDave Kleikamp static inline int 296de05ca85STheodore Ts'o __ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh, 297de05ca85STheodore Ts'o const char *function, unsigned int line) 298ac27a0ecSDave Kleikamp { 2993478c83cSTheodore Ts'o return check_xattrs(inode, bh, BFIRST(bh), bh->b_data + bh->b_size, 3003478c83cSTheodore Ts'o bh->b_data, function, line); 301ac27a0ecSDave Kleikamp } 302ac27a0ecSDave Kleikamp 303de05ca85STheodore Ts'o #define ext4_xattr_check_block(inode, bh) \ 304de05ca85STheodore Ts'o __ext4_xattr_check_block((inode), (bh), __func__, __LINE__) 305de05ca85STheodore Ts'o 306de05ca85STheodore Ts'o 3073478c83cSTheodore Ts'o static inline int 3089e92f48cSTheodore Ts'o __xattr_check_inode(struct inode *inode, struct ext4_xattr_ibody_header *header, 3099e92f48cSTheodore Ts'o void *end, const char *function, unsigned int line) 3109e92f48cSTheodore Ts'o { 3113478c83cSTheodore Ts'o return check_xattrs(inode, NULL, IFIRST(header), end, IFIRST(header), 3123478c83cSTheodore Ts'o function, line); 3139e92f48cSTheodore Ts'o } 3149e92f48cSTheodore Ts'o 3159e92f48cSTheodore Ts'o #define xattr_check_inode(inode, header, end) \ 3169e92f48cSTheodore Ts'o __xattr_check_inode((inode), (header), (end), __func__, __LINE__) 3179e92f48cSTheodore Ts'o 318ac27a0ecSDave Kleikamp static int 3199496005dSTheodore Ts'o xattr_find_entry(struct inode *inode, struct ext4_xattr_entry **pentry, 3209496005dSTheodore Ts'o void *end, int name_index, const char *name, int sorted) 321ac27a0ecSDave Kleikamp { 3229496005dSTheodore Ts'o struct ext4_xattr_entry *entry, *next; 323ac27a0ecSDave Kleikamp size_t name_len; 324ac27a0ecSDave Kleikamp int cmp = 1; 325ac27a0ecSDave Kleikamp 326ac27a0ecSDave Kleikamp if (name == NULL) 327ac27a0ecSDave Kleikamp return -EINVAL; 328ac27a0ecSDave Kleikamp name_len = strlen(name); 3299496005dSTheodore Ts'o for (entry = *pentry; !IS_LAST_ENTRY(entry); entry = next) { 3309496005dSTheodore Ts'o next = EXT4_XATTR_NEXT(entry); 3319496005dSTheodore Ts'o if ((void *) next >= end) { 3329496005dSTheodore Ts'o EXT4_ERROR_INODE(inode, "corrupted xattr entries"); 3339496005dSTheodore Ts'o return -EFSCORRUPTED; 3349496005dSTheodore Ts'o } 335ac27a0ecSDave Kleikamp cmp = name_index - entry->e_name_index; 336ac27a0ecSDave Kleikamp if (!cmp) 337ac27a0ecSDave Kleikamp cmp = name_len - entry->e_name_len; 338ac27a0ecSDave Kleikamp if (!cmp) 339ac27a0ecSDave Kleikamp cmp = memcmp(name, entry->e_name, name_len); 340ac27a0ecSDave Kleikamp if (cmp <= 0 && (sorted || cmp == 0)) 341ac27a0ecSDave Kleikamp break; 342ac27a0ecSDave Kleikamp } 343ac27a0ecSDave Kleikamp *pentry = entry; 344ac27a0ecSDave Kleikamp return cmp ? -ENODATA : 0; 345ac27a0ecSDave Kleikamp } 346ac27a0ecSDave Kleikamp 347dec214d0STahsin Erdogan static u32 348dec214d0STahsin Erdogan ext4_xattr_inode_hash(struct ext4_sb_info *sbi, const void *buffer, size_t size) 349dec214d0STahsin Erdogan { 350dec214d0STahsin Erdogan return ext4_chksum(sbi, sbi->s_csum_seed, buffer, size); 351dec214d0STahsin Erdogan } 352dec214d0STahsin Erdogan 353dec214d0STahsin Erdogan static u64 ext4_xattr_inode_get_ref(struct inode *ea_inode) 354dec214d0STahsin Erdogan { 355dec214d0STahsin Erdogan return ((u64)ea_inode->i_ctime.tv_sec << 32) | 356ee73f9a5SJeff Layton (u32) inode_peek_iversion_raw(ea_inode); 357dec214d0STahsin Erdogan } 358dec214d0STahsin Erdogan 359dec214d0STahsin Erdogan static void ext4_xattr_inode_set_ref(struct inode *ea_inode, u64 ref_count) 360dec214d0STahsin Erdogan { 361dec214d0STahsin Erdogan ea_inode->i_ctime.tv_sec = (u32)(ref_count >> 32); 362ee73f9a5SJeff Layton inode_set_iversion_raw(ea_inode, ref_count & 0xffffffff); 363dec214d0STahsin Erdogan } 364dec214d0STahsin Erdogan 365dec214d0STahsin Erdogan static u32 ext4_xattr_inode_get_hash(struct inode *ea_inode) 366dec214d0STahsin Erdogan { 367dec214d0STahsin Erdogan return (u32)ea_inode->i_atime.tv_sec; 368dec214d0STahsin Erdogan } 369dec214d0STahsin Erdogan 370dec214d0STahsin Erdogan static void ext4_xattr_inode_set_hash(struct inode *ea_inode, u32 hash) 371dec214d0STahsin Erdogan { 372dec214d0STahsin Erdogan ea_inode->i_atime.tv_sec = hash; 373dec214d0STahsin Erdogan } 374dec214d0STahsin Erdogan 375e50e5129SAndreas Dilger /* 376e50e5129SAndreas Dilger * Read the EA value from an inode. 377e50e5129SAndreas Dilger */ 37890966693STahsin Erdogan static int ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t size) 379e50e5129SAndreas Dilger { 3809699d4f9STahsin Erdogan int blocksize = 1 << ea_inode->i_blkbits; 3819699d4f9STahsin Erdogan int bh_count = (size + blocksize - 1) >> ea_inode->i_blkbits; 3829699d4f9STahsin Erdogan int tail_size = (size % blocksize) ?: blocksize; 3839699d4f9STahsin Erdogan struct buffer_head *bhs_inline[8]; 3849699d4f9STahsin Erdogan struct buffer_head **bhs = bhs_inline; 3859699d4f9STahsin Erdogan int i, ret; 386e50e5129SAndreas Dilger 3879699d4f9STahsin Erdogan if (bh_count > ARRAY_SIZE(bhs_inline)) { 3889699d4f9STahsin Erdogan bhs = kmalloc_array(bh_count, sizeof(*bhs), GFP_NOFS); 3899699d4f9STahsin Erdogan if (!bhs) 3909699d4f9STahsin Erdogan return -ENOMEM; 391e50e5129SAndreas Dilger } 3929699d4f9STahsin Erdogan 3939699d4f9STahsin Erdogan ret = ext4_bread_batch(ea_inode, 0 /* block */, bh_count, 3949699d4f9STahsin Erdogan true /* wait */, bhs); 3959699d4f9STahsin Erdogan if (ret) 3969699d4f9STahsin Erdogan goto free_bhs; 3979699d4f9STahsin Erdogan 3989699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) { 3999699d4f9STahsin Erdogan /* There shouldn't be any holes in ea_inode. */ 4009699d4f9STahsin Erdogan if (!bhs[i]) { 4019699d4f9STahsin Erdogan ret = -EFSCORRUPTED; 4029699d4f9STahsin Erdogan goto put_bhs; 4039699d4f9STahsin Erdogan } 4049699d4f9STahsin Erdogan memcpy((char *)buf + blocksize * i, bhs[i]->b_data, 4059699d4f9STahsin Erdogan i < bh_count - 1 ? blocksize : tail_size); 4069699d4f9STahsin Erdogan } 4079699d4f9STahsin Erdogan ret = 0; 4089699d4f9STahsin Erdogan put_bhs: 4099699d4f9STahsin Erdogan for (i = 0; i < bh_count; i++) 4109699d4f9STahsin Erdogan brelse(bhs[i]); 4119699d4f9STahsin Erdogan free_bhs: 4129699d4f9STahsin Erdogan if (bhs != bhs_inline) 4139699d4f9STahsin Erdogan kfree(bhs); 4149699d4f9STahsin Erdogan return ret; 415e50e5129SAndreas Dilger } 416e50e5129SAndreas Dilger 417a6d05676STahsin Erdogan #define EXT4_XATTR_INODE_GET_PARENT(inode) ((__u32)(inode)->i_mtime.tv_sec) 418a6d05676STahsin Erdogan 419bab79b04STahsin Erdogan static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, 420a6d05676STahsin Erdogan u32 ea_inode_hash, struct inode **ea_inode) 421e50e5129SAndreas Dilger { 422bab79b04STahsin Erdogan struct inode *inode; 423bab79b04STahsin Erdogan int err; 424e50e5129SAndreas Dilger 4258a363970STheodore Ts'o inode = ext4_iget(parent->i_sb, ea_ino, EXT4_IGET_NORMAL); 426bab79b04STahsin Erdogan if (IS_ERR(inode)) { 427bab79b04STahsin Erdogan err = PTR_ERR(inode); 428dec214d0STahsin Erdogan ext4_error(parent->i_sb, 429dec214d0STahsin Erdogan "error while reading EA inode %lu err=%d", ea_ino, 430dec214d0STahsin Erdogan err); 431bab79b04STahsin Erdogan return err; 432e50e5129SAndreas Dilger } 433e50e5129SAndreas Dilger 434bab79b04STahsin Erdogan if (is_bad_inode(inode)) { 435dec214d0STahsin Erdogan ext4_error(parent->i_sb, 436dec214d0STahsin Erdogan "error while reading EA inode %lu is_bad_inode", 437dec214d0STahsin Erdogan ea_ino); 438bab79b04STahsin Erdogan err = -EIO; 439e50e5129SAndreas Dilger goto error; 440e50e5129SAndreas Dilger } 441e50e5129SAndreas Dilger 442bab79b04STahsin Erdogan if (!(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL)) { 443dec214d0STahsin Erdogan ext4_error(parent->i_sb, 444dec214d0STahsin Erdogan "EA inode %lu does not have EXT4_EA_INODE_FL flag", 445dec214d0STahsin Erdogan ea_ino); 446bab79b04STahsin Erdogan err = -EINVAL; 447e50e5129SAndreas Dilger goto error; 448e50e5129SAndreas Dilger } 449e50e5129SAndreas Dilger 450a6d05676STahsin Erdogan ext4_xattr_inode_set_class(inode); 451a6d05676STahsin Erdogan 452a6d05676STahsin Erdogan /* 453a6d05676STahsin Erdogan * Check whether this is an old Lustre-style xattr inode. Lustre 454a6d05676STahsin Erdogan * implementation does not have hash validation, rather it has a 455a6d05676STahsin Erdogan * backpointer from ea_inode to the parent inode. 456a6d05676STahsin Erdogan */ 457a6d05676STahsin Erdogan if (ea_inode_hash != ext4_xattr_inode_get_hash(inode) && 458a6d05676STahsin Erdogan EXT4_XATTR_INODE_GET_PARENT(inode) == parent->i_ino && 459a6d05676STahsin Erdogan inode->i_generation == parent->i_generation) { 460a6d05676STahsin Erdogan ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); 461a6d05676STahsin Erdogan ext4_xattr_inode_set_ref(inode, 1); 462a6d05676STahsin Erdogan } else { 463a6d05676STahsin Erdogan inode_lock(inode); 464a6d05676STahsin Erdogan inode->i_flags |= S_NOQUOTA; 465a6d05676STahsin Erdogan inode_unlock(inode); 466a6d05676STahsin Erdogan } 467a6d05676STahsin Erdogan 468bab79b04STahsin Erdogan *ea_inode = inode; 469bab79b04STahsin Erdogan return 0; 470e50e5129SAndreas Dilger error: 471bab79b04STahsin Erdogan iput(inode); 472bab79b04STahsin Erdogan return err; 473e50e5129SAndreas Dilger } 474e50e5129SAndreas Dilger 4756bc0d63dSJan Kara /* Remove entry from mbcache when EA inode is getting evicted */ 4766bc0d63dSJan Kara void ext4_evict_ea_inode(struct inode *inode) 4776bc0d63dSJan Kara { 47865f8b800SJan Kara struct mb_cache_entry *oe; 47965f8b800SJan Kara 48065f8b800SJan Kara if (!EA_INODE_CACHE(inode)) 48165f8b800SJan Kara return; 48265f8b800SJan Kara /* Wait for entry to get unused so that we can remove it */ 48365f8b800SJan Kara while ((oe = mb_cache_entry_delete_or_get(EA_INODE_CACHE(inode), 48465f8b800SJan Kara ext4_xattr_inode_get_hash(inode), inode->i_ino))) { 48565f8b800SJan Kara mb_cache_entry_wait_unused(oe); 48665f8b800SJan Kara mb_cache_entry_put(EA_INODE_CACHE(inode), oe); 48765f8b800SJan Kara } 4886bc0d63dSJan Kara } 4896bc0d63dSJan Kara 490dec214d0STahsin Erdogan static int 491b9fc761eSTahsin Erdogan ext4_xattr_inode_verify_hashes(struct inode *ea_inode, 492b9fc761eSTahsin Erdogan struct ext4_xattr_entry *entry, void *buffer, 493b9fc761eSTahsin Erdogan size_t size) 494dec214d0STahsin Erdogan { 495dec214d0STahsin Erdogan u32 hash; 496dec214d0STahsin Erdogan 497dec214d0STahsin Erdogan /* Verify stored hash matches calculated hash. */ 498dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(ea_inode->i_sb), buffer, size); 499dec214d0STahsin Erdogan if (hash != ext4_xattr_inode_get_hash(ea_inode)) 500dec214d0STahsin Erdogan return -EFSCORRUPTED; 501b9fc761eSTahsin Erdogan 502b9fc761eSTahsin Erdogan if (entry) { 503b9fc761eSTahsin Erdogan __le32 e_hash, tmp_data; 504b9fc761eSTahsin Erdogan 505b9fc761eSTahsin Erdogan /* Verify entry hash. */ 506b9fc761eSTahsin Erdogan tmp_data = cpu_to_le32(hash); 507b9fc761eSTahsin Erdogan e_hash = ext4_xattr_hash_entry(entry->e_name, entry->e_name_len, 508b9fc761eSTahsin Erdogan &tmp_data, 1); 509f3bbac32SLinus Torvalds /* All good? */ 510f3bbac32SLinus Torvalds if (e_hash == entry->e_hash) 511f3bbac32SLinus Torvalds return 0; 512f3bbac32SLinus Torvalds 513f3bbac32SLinus Torvalds /* 514f3bbac32SLinus Torvalds * Not good. Maybe the entry hash was calculated 515f3bbac32SLinus Torvalds * using the buggy signed char version? 516f3bbac32SLinus Torvalds */ 517f3bbac32SLinus Torvalds e_hash = ext4_xattr_hash_entry_signed(entry->e_name, entry->e_name_len, 518f3bbac32SLinus Torvalds &tmp_data, 1); 519f3bbac32SLinus Torvalds if (e_hash == entry->e_hash) 520f3bbac32SLinus Torvalds return 0; 521f3bbac32SLinus Torvalds 522f3bbac32SLinus Torvalds /* Still no match - bad */ 523b9fc761eSTahsin Erdogan return -EFSCORRUPTED; 524b9fc761eSTahsin Erdogan } 525dec214d0STahsin Erdogan return 0; 526dec214d0STahsin Erdogan } 527dec214d0STahsin Erdogan 528e50e5129SAndreas Dilger /* 529b9fc761eSTahsin Erdogan * Read xattr value from the EA inode. 530e50e5129SAndreas Dilger */ 531e50e5129SAndreas Dilger static int 532b9fc761eSTahsin Erdogan ext4_xattr_inode_get(struct inode *inode, struct ext4_xattr_entry *entry, 533b9fc761eSTahsin Erdogan void *buffer, size_t size) 534e50e5129SAndreas Dilger { 535dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 536bab79b04STahsin Erdogan struct inode *ea_inode; 537dec214d0STahsin Erdogan int err; 538e50e5129SAndreas Dilger 539b9fc761eSTahsin Erdogan err = ext4_xattr_inode_iget(inode, le32_to_cpu(entry->e_value_inum), 540a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), &ea_inode); 541dec214d0STahsin Erdogan if (err) { 542dec214d0STahsin Erdogan ea_inode = NULL; 543dec214d0STahsin Erdogan goto out; 544dec214d0STahsin Erdogan } 545e50e5129SAndreas Dilger 546dec214d0STahsin Erdogan if (i_size_read(ea_inode) != size) { 547dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 548dec214d0STahsin Erdogan "ea_inode file size=%llu entry size=%zu", 549dec214d0STahsin Erdogan i_size_read(ea_inode), size); 550dec214d0STahsin Erdogan err = -EFSCORRUPTED; 551dec214d0STahsin Erdogan goto out; 552dec214d0STahsin Erdogan } 553dec214d0STahsin Erdogan 554dec214d0STahsin Erdogan err = ext4_xattr_inode_read(ea_inode, buffer, size); 555dec214d0STahsin Erdogan if (err) 556dec214d0STahsin Erdogan goto out; 557dec214d0STahsin Erdogan 558a6d05676STahsin Erdogan if (!ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) { 559a6d05676STahsin Erdogan err = ext4_xattr_inode_verify_hashes(ea_inode, entry, buffer, 560a6d05676STahsin Erdogan size); 561a6d05676STahsin Erdogan if (err) { 562dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 563dec214d0STahsin Erdogan "EA inode hash validation failed"); 564dec214d0STahsin Erdogan goto out; 565dec214d0STahsin Erdogan } 566dec214d0STahsin Erdogan 567dec214d0STahsin Erdogan if (ea_inode_cache) 568dec214d0STahsin Erdogan mb_cache_entry_create(ea_inode_cache, GFP_NOFS, 569dec214d0STahsin Erdogan ext4_xattr_inode_get_hash(ea_inode), 570dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 571a6d05676STahsin Erdogan } 572dec214d0STahsin Erdogan out: 573e50e5129SAndreas Dilger iput(ea_inode); 574dec214d0STahsin Erdogan return err; 575e50e5129SAndreas Dilger } 576e50e5129SAndreas Dilger 577ac27a0ecSDave Kleikamp static int 578617ba13bSMingming Cao ext4_xattr_block_get(struct inode *inode, int name_index, const char *name, 579ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 580ac27a0ecSDave Kleikamp { 581ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 582617ba13bSMingming Cao struct ext4_xattr_entry *entry; 583ac27a0ecSDave Kleikamp size_t size; 5849496005dSTheodore Ts'o void *end; 585ac27a0ecSDave Kleikamp int error; 58647387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 587ac27a0ecSDave Kleikamp 588ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", 589ac27a0ecSDave Kleikamp name_index, name, buffer, (long)buffer_size); 590ac27a0ecSDave Kleikamp 591617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 592fb265c9cSTheodore Ts'o return -ENODATA; 593ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 594ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 595fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 596fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 597fb265c9cSTheodore Ts'o return PTR_ERR(bh); 598ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 599ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 600de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 601de05ca85STheodore Ts'o if (error) 602ac27a0ecSDave Kleikamp goto cleanup; 60347387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bh); 604ac27a0ecSDave Kleikamp entry = BFIRST(bh); 6059496005dSTheodore Ts'o end = bh->b_data + bh->b_size; 6069496005dSTheodore Ts'o error = xattr_find_entry(inode, &entry, end, name_index, name, 1); 607ac27a0ecSDave Kleikamp if (error) 608ac27a0ecSDave Kleikamp goto cleanup; 609ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 610ac27a0ecSDave Kleikamp error = -ERANGE; 61154dd0e0aSTheodore Ts'o if (unlikely(size > EXT4_XATTR_SIZE_MAX)) 61254dd0e0aSTheodore Ts'o goto cleanup; 61354dd0e0aSTheodore Ts'o if (buffer) { 614ac27a0ecSDave Kleikamp if (size > buffer_size) 615ac27a0ecSDave Kleikamp goto cleanup; 616e50e5129SAndreas Dilger if (entry->e_value_inum) { 617b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 618b9fc761eSTahsin Erdogan size); 619e50e5129SAndreas Dilger if (error) 620e50e5129SAndreas Dilger goto cleanup; 621e50e5129SAndreas Dilger } else { 62254dd0e0aSTheodore Ts'o u16 offset = le16_to_cpu(entry->e_value_offs); 62354dd0e0aSTheodore Ts'o void *p = bh->b_data + offset; 62454dd0e0aSTheodore Ts'o 62554dd0e0aSTheodore Ts'o if (unlikely(p + size > end)) 62654dd0e0aSTheodore Ts'o goto cleanup; 62754dd0e0aSTheodore Ts'o memcpy(buffer, p, size); 628e50e5129SAndreas Dilger } 629ac27a0ecSDave Kleikamp } 630ac27a0ecSDave Kleikamp error = size; 631ac27a0ecSDave Kleikamp 632ac27a0ecSDave Kleikamp cleanup: 633ac27a0ecSDave Kleikamp brelse(bh); 634ac27a0ecSDave Kleikamp return error; 635ac27a0ecSDave Kleikamp } 636ac27a0ecSDave Kleikamp 637879b3825STao Ma int 638617ba13bSMingming Cao ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name, 639ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 640ac27a0ecSDave Kleikamp { 641617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 642617ba13bSMingming Cao struct ext4_xattr_entry *entry; 643617ba13bSMingming Cao struct ext4_inode *raw_inode; 644617ba13bSMingming Cao struct ext4_iloc iloc; 645ac27a0ecSDave Kleikamp size_t size; 646ac27a0ecSDave Kleikamp void *end; 647ac27a0ecSDave Kleikamp int error; 648ac27a0ecSDave Kleikamp 64919f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 650ac27a0ecSDave Kleikamp return -ENODATA; 651617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 652ac27a0ecSDave Kleikamp if (error) 653ac27a0ecSDave Kleikamp return error; 654617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 655ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 656617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 6579e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 658ac27a0ecSDave Kleikamp if (error) 659ac27a0ecSDave Kleikamp goto cleanup; 6606ba644b9SEric Biggers entry = IFIRST(header); 6619496005dSTheodore Ts'o error = xattr_find_entry(inode, &entry, end, name_index, name, 0); 662ac27a0ecSDave Kleikamp if (error) 663ac27a0ecSDave Kleikamp goto cleanup; 664ac27a0ecSDave Kleikamp size = le32_to_cpu(entry->e_value_size); 665ac27a0ecSDave Kleikamp error = -ERANGE; 66654dd0e0aSTheodore Ts'o if (unlikely(size > EXT4_XATTR_SIZE_MAX)) 66754dd0e0aSTheodore Ts'o goto cleanup; 66854dd0e0aSTheodore Ts'o if (buffer) { 669ac27a0ecSDave Kleikamp if (size > buffer_size) 670ac27a0ecSDave Kleikamp goto cleanup; 671e50e5129SAndreas Dilger if (entry->e_value_inum) { 672b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, 673b9fc761eSTahsin Erdogan size); 674e50e5129SAndreas Dilger if (error) 675e50e5129SAndreas Dilger goto cleanup; 676e50e5129SAndreas Dilger } else { 67754dd0e0aSTheodore Ts'o u16 offset = le16_to_cpu(entry->e_value_offs); 67854dd0e0aSTheodore Ts'o void *p = (void *)IFIRST(header) + offset; 67954dd0e0aSTheodore Ts'o 68054dd0e0aSTheodore Ts'o if (unlikely(p + size > end)) 68154dd0e0aSTheodore Ts'o goto cleanup; 68254dd0e0aSTheodore Ts'o memcpy(buffer, p, size); 683ac27a0ecSDave Kleikamp } 684e50e5129SAndreas Dilger } 685ac27a0ecSDave Kleikamp error = size; 686ac27a0ecSDave Kleikamp 687ac27a0ecSDave Kleikamp cleanup: 688ac27a0ecSDave Kleikamp brelse(iloc.bh); 689ac27a0ecSDave Kleikamp return error; 690ac27a0ecSDave Kleikamp } 691ac27a0ecSDave Kleikamp 692ac27a0ecSDave Kleikamp /* 693617ba13bSMingming Cao * ext4_xattr_get() 694ac27a0ecSDave Kleikamp * 695ac27a0ecSDave Kleikamp * Copy an extended attribute into the buffer 696ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 697ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 698ac27a0ecSDave Kleikamp * 699ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 700ac27a0ecSDave Kleikamp * used / required on success. 701ac27a0ecSDave Kleikamp */ 702ac27a0ecSDave Kleikamp int 703617ba13bSMingming Cao ext4_xattr_get(struct inode *inode, int name_index, const char *name, 704ac27a0ecSDave Kleikamp void *buffer, size_t buffer_size) 705ac27a0ecSDave Kleikamp { 706ac27a0ecSDave Kleikamp int error; 707ac27a0ecSDave Kleikamp 7080db1ff22STheodore Ts'o if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) 7090db1ff22STheodore Ts'o return -EIO; 7100db1ff22STheodore Ts'o 711230b8c1aSZhang Zhen if (strlen(name) > 255) 712230b8c1aSZhang Zhen return -ERANGE; 713230b8c1aSZhang Zhen 714617ba13bSMingming Cao down_read(&EXT4_I(inode)->xattr_sem); 715617ba13bSMingming Cao error = ext4_xattr_ibody_get(inode, name_index, name, buffer, 716ac27a0ecSDave Kleikamp buffer_size); 717ac27a0ecSDave Kleikamp if (error == -ENODATA) 718617ba13bSMingming Cao error = ext4_xattr_block_get(inode, name_index, name, buffer, 719ac27a0ecSDave Kleikamp buffer_size); 720617ba13bSMingming Cao up_read(&EXT4_I(inode)->xattr_sem); 721ac27a0ecSDave Kleikamp return error; 722ac27a0ecSDave Kleikamp } 723ac27a0ecSDave Kleikamp 724ac27a0ecSDave Kleikamp static int 725431547b3SChristoph Hellwig ext4_xattr_list_entries(struct dentry *dentry, struct ext4_xattr_entry *entry, 726ac27a0ecSDave Kleikamp char *buffer, size_t buffer_size) 727ac27a0ecSDave Kleikamp { 728ac27a0ecSDave Kleikamp size_t rest = buffer_size; 729ac27a0ecSDave Kleikamp 730617ba13bSMingming Cao for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { 73111e27528SStephen Hemminger const struct xattr_handler *handler = 732617ba13bSMingming Cao ext4_xattr_handler(entry->e_name_index); 733ac27a0ecSDave Kleikamp 734764a5c6bSAndreas Gruenbacher if (handler && (!handler->list || handler->list(dentry))) { 735764a5c6bSAndreas Gruenbacher const char *prefix = handler->prefix ?: handler->name; 736764a5c6bSAndreas Gruenbacher size_t prefix_len = strlen(prefix); 737764a5c6bSAndreas Gruenbacher size_t size = prefix_len + entry->e_name_len + 1; 738764a5c6bSAndreas Gruenbacher 739ac27a0ecSDave Kleikamp if (buffer) { 740ac27a0ecSDave Kleikamp if (size > rest) 741ac27a0ecSDave Kleikamp return -ERANGE; 742764a5c6bSAndreas Gruenbacher memcpy(buffer, prefix, prefix_len); 743764a5c6bSAndreas Gruenbacher buffer += prefix_len; 744764a5c6bSAndreas Gruenbacher memcpy(buffer, entry->e_name, entry->e_name_len); 745764a5c6bSAndreas Gruenbacher buffer += entry->e_name_len; 746764a5c6bSAndreas Gruenbacher *buffer++ = 0; 747ac27a0ecSDave Kleikamp } 748ac27a0ecSDave Kleikamp rest -= size; 749ac27a0ecSDave Kleikamp } 750ac27a0ecSDave Kleikamp } 751764a5c6bSAndreas Gruenbacher return buffer_size - rest; /* total size */ 752ac27a0ecSDave Kleikamp } 753ac27a0ecSDave Kleikamp 754ac27a0ecSDave Kleikamp static int 755431547b3SChristoph Hellwig ext4_xattr_block_list(struct dentry *dentry, char *buffer, size_t buffer_size) 756ac27a0ecSDave Kleikamp { 7572b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 758ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 759ac27a0ecSDave Kleikamp int error; 760ac27a0ecSDave Kleikamp 761ac27a0ecSDave Kleikamp ea_idebug(inode, "buffer=%p, buffer_size=%ld", 762ac27a0ecSDave Kleikamp buffer, (long)buffer_size); 763ac27a0ecSDave Kleikamp 764617ba13bSMingming Cao if (!EXT4_I(inode)->i_file_acl) 765fb265c9cSTheodore Ts'o return 0; 766ace36ad4SJoe Perches ea_idebug(inode, "reading block %llu", 767ace36ad4SJoe Perches (unsigned long long)EXT4_I(inode)->i_file_acl); 768fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 769fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 770fb265c9cSTheodore Ts'o return PTR_ERR(bh); 771ac27a0ecSDave Kleikamp ea_bdebug(bh, "b_count=%d, refcount=%d", 772ac27a0ecSDave Kleikamp atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); 773de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 774de05ca85STheodore Ts'o if (error) 775ac27a0ecSDave Kleikamp goto cleanup; 77647387409STahsin Erdogan ext4_xattr_block_cache_insert(EA_BLOCK_CACHE(inode), bh); 777fb265c9cSTheodore Ts'o error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, 778fb265c9cSTheodore Ts'o buffer_size); 779ac27a0ecSDave Kleikamp cleanup: 780ac27a0ecSDave Kleikamp brelse(bh); 781ac27a0ecSDave Kleikamp return error; 782ac27a0ecSDave Kleikamp } 783ac27a0ecSDave Kleikamp 784ac27a0ecSDave Kleikamp static int 785431547b3SChristoph Hellwig ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size) 786ac27a0ecSDave Kleikamp { 7872b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 788617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 789617ba13bSMingming Cao struct ext4_inode *raw_inode; 790617ba13bSMingming Cao struct ext4_iloc iloc; 791ac27a0ecSDave Kleikamp void *end; 792ac27a0ecSDave Kleikamp int error; 793ac27a0ecSDave Kleikamp 79419f5fb7aSTheodore Ts'o if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) 795ac27a0ecSDave Kleikamp return 0; 796617ba13bSMingming Cao error = ext4_get_inode_loc(inode, &iloc); 797ac27a0ecSDave Kleikamp if (error) 798ac27a0ecSDave Kleikamp return error; 799617ba13bSMingming Cao raw_inode = ext4_raw_inode(&iloc); 800ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 801617ba13bSMingming Cao end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 8029e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 803ac27a0ecSDave Kleikamp if (error) 804ac27a0ecSDave Kleikamp goto cleanup; 805431547b3SChristoph Hellwig error = ext4_xattr_list_entries(dentry, IFIRST(header), 806ac27a0ecSDave Kleikamp buffer, buffer_size); 807ac27a0ecSDave Kleikamp 808ac27a0ecSDave Kleikamp cleanup: 809ac27a0ecSDave Kleikamp brelse(iloc.bh); 810ac27a0ecSDave Kleikamp return error; 811ac27a0ecSDave Kleikamp } 812ac27a0ecSDave Kleikamp 813ac27a0ecSDave Kleikamp /* 814ba7ea1d8SEric Biggers * Inode operation listxattr() 815ba7ea1d8SEric Biggers * 816ba7ea1d8SEric Biggers * d_inode(dentry)->i_rwsem: don't care 817ac27a0ecSDave Kleikamp * 818ac27a0ecSDave Kleikamp * Copy a list of attribute names into the buffer 819ac27a0ecSDave Kleikamp * provided, or compute the buffer size required. 820ac27a0ecSDave Kleikamp * Buffer is NULL to compute the size of the buffer required. 821ac27a0ecSDave Kleikamp * 822ac27a0ecSDave Kleikamp * Returns a negative error number on failure, or the number of bytes 823ac27a0ecSDave Kleikamp * used / required on success. 824ac27a0ecSDave Kleikamp */ 825ba7ea1d8SEric Biggers ssize_t 826ba7ea1d8SEric Biggers ext4_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 827ac27a0ecSDave Kleikamp { 828eaeef867STheodore Ts'o int ret, ret2; 829ac27a0ecSDave Kleikamp 8302b0143b5SDavid Howells down_read(&EXT4_I(d_inode(dentry))->xattr_sem); 831eaeef867STheodore Ts'o ret = ret2 = ext4_xattr_ibody_list(dentry, buffer, buffer_size); 832eaeef867STheodore Ts'o if (ret < 0) 833eaeef867STheodore Ts'o goto errout; 834ac27a0ecSDave Kleikamp if (buffer) { 835eaeef867STheodore Ts'o buffer += ret; 836eaeef867STheodore Ts'o buffer_size -= ret; 837ac27a0ecSDave Kleikamp } 838eaeef867STheodore Ts'o ret = ext4_xattr_block_list(dentry, buffer, buffer_size); 839eaeef867STheodore Ts'o if (ret < 0) 840eaeef867STheodore Ts'o goto errout; 841eaeef867STheodore Ts'o ret += ret2; 842eaeef867STheodore Ts'o errout: 8432b0143b5SDavid Howells up_read(&EXT4_I(d_inode(dentry))->xattr_sem); 844eaeef867STheodore Ts'o return ret; 845ac27a0ecSDave Kleikamp } 846ac27a0ecSDave Kleikamp 847ac27a0ecSDave Kleikamp /* 848617ba13bSMingming Cao * If the EXT4_FEATURE_COMPAT_EXT_ATTR feature of this file system is 849ac27a0ecSDave Kleikamp * not set, set it. 850ac27a0ecSDave Kleikamp */ 851617ba13bSMingming Cao static void ext4_xattr_update_super_block(handle_t *handle, 852ac27a0ecSDave Kleikamp struct super_block *sb) 853ac27a0ecSDave Kleikamp { 854e2b911c5SDarrick J. Wong if (ext4_has_feature_xattr(sb)) 855ac27a0ecSDave Kleikamp return; 856ac27a0ecSDave Kleikamp 8575d601255Sliang xie BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access"); 858188c299eSJan Kara if (ext4_journal_get_write_access(handle, sb, EXT4_SB(sb)->s_sbh, 859188c299eSJan Kara EXT4_JTR_NONE) == 0) { 86005c2c00fSJan Kara lock_buffer(EXT4_SB(sb)->s_sbh); 861e2b911c5SDarrick J. Wong ext4_set_feature_xattr(sb); 86205c2c00fSJan Kara ext4_superblock_csum_set(sb); 86305c2c00fSJan Kara unlock_buffer(EXT4_SB(sb)->s_sbh); 864a3f5cf14SJan Kara ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh); 865ac27a0ecSDave Kleikamp } 866ac27a0ecSDave Kleikamp } 867ac27a0ecSDave Kleikamp 8687a9ca53aSTahsin Erdogan int ext4_get_inode_usage(struct inode *inode, qsize_t *usage) 8697a9ca53aSTahsin Erdogan { 8707a9ca53aSTahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 8717a9ca53aSTahsin Erdogan struct buffer_head *bh = NULL; 8727a9ca53aSTahsin Erdogan struct ext4_inode *raw_inode; 8737a9ca53aSTahsin Erdogan struct ext4_xattr_ibody_header *header; 8747a9ca53aSTahsin Erdogan struct ext4_xattr_entry *entry; 8757a9ca53aSTahsin Erdogan qsize_t ea_inode_refs = 0; 8767a9ca53aSTahsin Erdogan void *end; 8777a9ca53aSTahsin Erdogan int ret; 8787a9ca53aSTahsin Erdogan 8797a9ca53aSTahsin Erdogan lockdep_assert_held_read(&EXT4_I(inode)->xattr_sem); 8807a9ca53aSTahsin Erdogan 8817a9ca53aSTahsin Erdogan if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 8827a9ca53aSTahsin Erdogan ret = ext4_get_inode_loc(inode, &iloc); 8837a9ca53aSTahsin Erdogan if (ret) 8847a9ca53aSTahsin Erdogan goto out; 8857a9ca53aSTahsin Erdogan raw_inode = ext4_raw_inode(&iloc); 8867a9ca53aSTahsin Erdogan header = IHDR(inode, raw_inode); 8877a9ca53aSTahsin Erdogan end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 8887a9ca53aSTahsin Erdogan ret = xattr_check_inode(inode, header, end); 8897a9ca53aSTahsin Erdogan if (ret) 8907a9ca53aSTahsin Erdogan goto out; 8917a9ca53aSTahsin Erdogan 8927a9ca53aSTahsin Erdogan for (entry = IFIRST(header); !IS_LAST_ENTRY(entry); 8937a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 8947a9ca53aSTahsin Erdogan if (entry->e_value_inum) 8957a9ca53aSTahsin Erdogan ea_inode_refs++; 8967a9ca53aSTahsin Erdogan } 8977a9ca53aSTahsin Erdogan 8987a9ca53aSTahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 899fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 900fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 901fb265c9cSTheodore Ts'o ret = PTR_ERR(bh); 9027159a986SDan Carpenter bh = NULL; 9037a9ca53aSTahsin Erdogan goto out; 9047a9ca53aSTahsin Erdogan } 9057a9ca53aSTahsin Erdogan 906de05ca85STheodore Ts'o ret = ext4_xattr_check_block(inode, bh); 907de05ca85STheodore Ts'o if (ret) 9087a9ca53aSTahsin Erdogan goto out; 9097a9ca53aSTahsin Erdogan 9107a9ca53aSTahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 9117a9ca53aSTahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) 9127a9ca53aSTahsin Erdogan if (entry->e_value_inum) 9137a9ca53aSTahsin Erdogan ea_inode_refs++; 9147a9ca53aSTahsin Erdogan } 9157a9ca53aSTahsin Erdogan *usage = ea_inode_refs + 1; 9167a9ca53aSTahsin Erdogan ret = 0; 9177a9ca53aSTahsin Erdogan out: 9187a9ca53aSTahsin Erdogan brelse(iloc.bh); 9197a9ca53aSTahsin Erdogan brelse(bh); 9207a9ca53aSTahsin Erdogan return ret; 9217a9ca53aSTahsin Erdogan } 9227a9ca53aSTahsin Erdogan 923dec214d0STahsin Erdogan static inline size_t round_up_cluster(struct inode *inode, size_t length) 924dec214d0STahsin Erdogan { 925dec214d0STahsin Erdogan struct super_block *sb = inode->i_sb; 926dec214d0STahsin Erdogan size_t cluster_size = 1 << (EXT4_SB(sb)->s_cluster_bits + 927dec214d0STahsin Erdogan inode->i_blkbits); 928dec214d0STahsin Erdogan size_t mask = ~(cluster_size - 1); 929dec214d0STahsin Erdogan 930dec214d0STahsin Erdogan return (length + cluster_size - 1) & mask; 931dec214d0STahsin Erdogan } 932dec214d0STahsin Erdogan 933dec214d0STahsin Erdogan static int ext4_xattr_inode_alloc_quota(struct inode *inode, size_t len) 934dec214d0STahsin Erdogan { 935dec214d0STahsin Erdogan int err; 936dec214d0STahsin Erdogan 937dec214d0STahsin Erdogan err = dquot_alloc_inode(inode); 938dec214d0STahsin Erdogan if (err) 939dec214d0STahsin Erdogan return err; 940dec214d0STahsin Erdogan err = dquot_alloc_space_nodirty(inode, round_up_cluster(inode, len)); 941dec214d0STahsin Erdogan if (err) 942dec214d0STahsin Erdogan dquot_free_inode(inode); 943dec214d0STahsin Erdogan return err; 944dec214d0STahsin Erdogan } 945dec214d0STahsin Erdogan 946a6d05676STahsin Erdogan static void ext4_xattr_inode_free_quota(struct inode *parent, 947a6d05676STahsin Erdogan struct inode *ea_inode, 948a6d05676STahsin Erdogan size_t len) 949dec214d0STahsin Erdogan { 950a6d05676STahsin Erdogan if (ea_inode && 951a6d05676STahsin Erdogan ext4_test_inode_state(ea_inode, EXT4_STATE_LUSTRE_EA_INODE)) 952a6d05676STahsin Erdogan return; 953a6d05676STahsin Erdogan dquot_free_space_nodirty(parent, round_up_cluster(parent, len)); 954a6d05676STahsin Erdogan dquot_free_inode(parent); 955dec214d0STahsin Erdogan } 956dec214d0STahsin Erdogan 957af65207cSTahsin Erdogan int __ext4_xattr_set_credits(struct super_block *sb, struct inode *inode, 958af65207cSTahsin Erdogan struct buffer_head *block_bh, size_t value_len, 959af65207cSTahsin Erdogan bool is_create) 960dec214d0STahsin Erdogan { 961dec214d0STahsin Erdogan int credits; 962dec214d0STahsin Erdogan int blocks; 963dec214d0STahsin Erdogan 964dec214d0STahsin Erdogan /* 965dec214d0STahsin Erdogan * 1) Owner inode update 966dec214d0STahsin Erdogan * 2) Ref count update on old xattr block 967dec214d0STahsin Erdogan * 3) new xattr block 968dec214d0STahsin Erdogan * 4) block bitmap update for new xattr block 969dec214d0STahsin Erdogan * 5) group descriptor for new xattr block 970dec214d0STahsin Erdogan * 6) block bitmap update for old xattr block 971dec214d0STahsin Erdogan * 7) group descriptor for old block 972dec214d0STahsin Erdogan * 973dec214d0STahsin Erdogan * 6 & 7 can happen if we have two racing threads T_a and T_b 974dec214d0STahsin Erdogan * which are each trying to set an xattr on inodes I_a and I_b 975dec214d0STahsin Erdogan * which were both initially sharing an xattr block. 976dec214d0STahsin Erdogan */ 977dec214d0STahsin Erdogan credits = 7; 978dec214d0STahsin Erdogan 979dec214d0STahsin Erdogan /* Quota updates. */ 980dec214d0STahsin Erdogan credits += EXT4_MAXQUOTAS_TRANS_BLOCKS(sb); 981dec214d0STahsin Erdogan 982dec214d0STahsin Erdogan /* 983dec214d0STahsin Erdogan * In case of inline data, we may push out the data to a block, 984dec214d0STahsin Erdogan * so we need to reserve credits for this eventuality 985dec214d0STahsin Erdogan */ 986af65207cSTahsin Erdogan if (inode && ext4_has_inline_data(inode)) 987dec214d0STahsin Erdogan credits += ext4_writepage_trans_blocks(inode) + 1; 988dec214d0STahsin Erdogan 989dec214d0STahsin Erdogan /* We are done if ea_inode feature is not enabled. */ 990dec214d0STahsin Erdogan if (!ext4_has_feature_ea_inode(sb)) 991dec214d0STahsin Erdogan return credits; 992dec214d0STahsin Erdogan 993dec214d0STahsin Erdogan /* New ea_inode, inode map, block bitmap, group descriptor. */ 994dec214d0STahsin Erdogan credits += 4; 995dec214d0STahsin Erdogan 996dec214d0STahsin Erdogan /* Data blocks. */ 997dec214d0STahsin Erdogan blocks = (value_len + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 998dec214d0STahsin Erdogan 999dec214d0STahsin Erdogan /* Indirection block or one level of extent tree. */ 1000dec214d0STahsin Erdogan blocks += 1; 1001dec214d0STahsin Erdogan 1002dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 1003dec214d0STahsin Erdogan credits += blocks * 2; 1004dec214d0STahsin Erdogan 1005dec214d0STahsin Erdogan /* Blocks themselves. */ 1006dec214d0STahsin Erdogan credits += blocks; 1007dec214d0STahsin Erdogan 1008af65207cSTahsin Erdogan if (!is_create) { 1009dec214d0STahsin Erdogan /* Dereference ea_inode holding old xattr value. 1010dec214d0STahsin Erdogan * Old ea_inode, inode map, block bitmap, group descriptor. 1011dec214d0STahsin Erdogan */ 1012dec214d0STahsin Erdogan credits += 4; 1013dec214d0STahsin Erdogan 1014dec214d0STahsin Erdogan /* Data blocks for old ea_inode. */ 1015dec214d0STahsin Erdogan blocks = XATTR_SIZE_MAX >> sb->s_blocksize_bits; 1016dec214d0STahsin Erdogan 1017af65207cSTahsin Erdogan /* Indirection block or one level of extent tree for old 1018af65207cSTahsin Erdogan * ea_inode. 1019af65207cSTahsin Erdogan */ 1020dec214d0STahsin Erdogan blocks += 1; 1021dec214d0STahsin Erdogan 1022dec214d0STahsin Erdogan /* Block bitmap and group descriptor updates for each block. */ 1023dec214d0STahsin Erdogan credits += blocks * 2; 1024af65207cSTahsin Erdogan } 1025dec214d0STahsin Erdogan 1026dec214d0STahsin Erdogan /* We may need to clone the existing xattr block in which case we need 1027dec214d0STahsin Erdogan * to increment ref counts for existing ea_inodes referenced by it. 1028dec214d0STahsin Erdogan */ 1029dec214d0STahsin Erdogan if (block_bh) { 1030dec214d0STahsin Erdogan struct ext4_xattr_entry *entry = BFIRST(block_bh); 1031dec214d0STahsin Erdogan 1032dec214d0STahsin Erdogan for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) 1033dec214d0STahsin Erdogan if (entry->e_value_inum) 1034dec214d0STahsin Erdogan /* Ref count update on ea_inode. */ 1035dec214d0STahsin Erdogan credits += 1; 1036dec214d0STahsin Erdogan } 1037dec214d0STahsin Erdogan return credits; 1038dec214d0STahsin Erdogan } 1039dec214d0STahsin Erdogan 1040dec214d0STahsin Erdogan static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, 1041dec214d0STahsin Erdogan int ref_change) 1042dec214d0STahsin Erdogan { 1043dec214d0STahsin Erdogan struct ext4_iloc iloc; 1044dec214d0STahsin Erdogan s64 ref_count; 1045dec214d0STahsin Erdogan int ret; 1046dec214d0STahsin Erdogan 1047dec214d0STahsin Erdogan inode_lock(ea_inode); 1048dec214d0STahsin Erdogan 1049dec214d0STahsin Erdogan ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); 10501bfc204dSVasily Averin if (ret) 1051dec214d0STahsin Erdogan goto out; 1052dec214d0STahsin Erdogan 1053dec214d0STahsin Erdogan ref_count = ext4_xattr_inode_get_ref(ea_inode); 1054dec214d0STahsin Erdogan ref_count += ref_change; 1055dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, ref_count); 1056dec214d0STahsin Erdogan 1057dec214d0STahsin Erdogan if (ref_change > 0) { 1058dec214d0STahsin Erdogan WARN_ONCE(ref_count <= 0, "EA inode %lu ref_count=%lld", 1059dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1060dec214d0STahsin Erdogan 1061dec214d0STahsin Erdogan if (ref_count == 1) { 1062dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink, "EA inode %lu i_nlink=%u", 1063dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1064dec214d0STahsin Erdogan 1065dec214d0STahsin Erdogan set_nlink(ea_inode, 1); 1066dec214d0STahsin Erdogan ext4_orphan_del(handle, ea_inode); 1067cdb7ee4cSTahsin Erdogan } 1068dec214d0STahsin Erdogan } else { 1069dec214d0STahsin Erdogan WARN_ONCE(ref_count < 0, "EA inode %lu ref_count=%lld", 1070dec214d0STahsin Erdogan ea_inode->i_ino, ref_count); 1071dec214d0STahsin Erdogan 1072dec214d0STahsin Erdogan if (ref_count == 0) { 1073dec214d0STahsin Erdogan WARN_ONCE(ea_inode->i_nlink != 1, 1074dec214d0STahsin Erdogan "EA inode %lu i_nlink=%u", 1075dec214d0STahsin Erdogan ea_inode->i_ino, ea_inode->i_nlink); 1076dec214d0STahsin Erdogan 1077dec214d0STahsin Erdogan clear_nlink(ea_inode); 1078dec214d0STahsin Erdogan ext4_orphan_add(handle, ea_inode); 1079dec214d0STahsin Erdogan } 1080cdb7ee4cSTahsin Erdogan } 1081dec214d0STahsin Erdogan 1082dec214d0STahsin Erdogan ret = ext4_mark_iloc_dirty(handle, ea_inode, &iloc); 1083dec214d0STahsin Erdogan if (ret) 1084dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 1085dec214d0STahsin Erdogan "ext4_mark_iloc_dirty() failed ret=%d", ret); 1086dec214d0STahsin Erdogan out: 1087dec214d0STahsin Erdogan inode_unlock(ea_inode); 1088dec214d0STahsin Erdogan return ret; 1089dec214d0STahsin Erdogan } 1090dec214d0STahsin Erdogan 1091dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref(handle_t *handle, struct inode *ea_inode) 1092dec214d0STahsin Erdogan { 1093dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, 1); 1094dec214d0STahsin Erdogan } 1095dec214d0STahsin Erdogan 1096dec214d0STahsin Erdogan static int ext4_xattr_inode_dec_ref(handle_t *handle, struct inode *ea_inode) 1097dec214d0STahsin Erdogan { 1098dec214d0STahsin Erdogan return ext4_xattr_inode_update_ref(handle, ea_inode, -1); 1099dec214d0STahsin Erdogan } 1100dec214d0STahsin Erdogan 1101dec214d0STahsin Erdogan static int ext4_xattr_inode_inc_ref_all(handle_t *handle, struct inode *parent, 1102dec214d0STahsin Erdogan struct ext4_xattr_entry *first) 1103dec214d0STahsin Erdogan { 1104dec214d0STahsin Erdogan struct inode *ea_inode; 1105dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 1106dec214d0STahsin Erdogan struct ext4_xattr_entry *failed_entry; 1107dec214d0STahsin Erdogan unsigned int ea_ino; 1108dec214d0STahsin Erdogan int err, saved_err; 1109dec214d0STahsin Erdogan 1110dec214d0STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 1111dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1112dec214d0STahsin Erdogan if (!entry->e_value_inum) 1113dec214d0STahsin Erdogan continue; 1114dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1115a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1116a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1117a6d05676STahsin Erdogan &ea_inode); 1118dec214d0STahsin Erdogan if (err) 1119dec214d0STahsin Erdogan goto cleanup; 1120dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1121dec214d0STahsin Erdogan if (err) { 1122dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "inc ref error %d", err); 1123dec214d0STahsin Erdogan iput(ea_inode); 1124dec214d0STahsin Erdogan goto cleanup; 1125dec214d0STahsin Erdogan } 1126dec214d0STahsin Erdogan iput(ea_inode); 1127dec214d0STahsin Erdogan } 1128dec214d0STahsin Erdogan return 0; 1129dec214d0STahsin Erdogan 1130dec214d0STahsin Erdogan cleanup: 1131dec214d0STahsin Erdogan saved_err = err; 1132dec214d0STahsin Erdogan failed_entry = entry; 1133dec214d0STahsin Erdogan 1134dec214d0STahsin Erdogan for (entry = first; entry != failed_entry; 1135dec214d0STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 1136dec214d0STahsin Erdogan if (!entry->e_value_inum) 1137dec214d0STahsin Erdogan continue; 1138dec214d0STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1139a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1140a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1141a6d05676STahsin Erdogan &ea_inode); 1142dec214d0STahsin Erdogan if (err) { 1143dec214d0STahsin Erdogan ext4_warning(parent->i_sb, 1144dec214d0STahsin Erdogan "cleanup ea_ino %u iget error %d", ea_ino, 1145dec214d0STahsin Erdogan err); 1146dec214d0STahsin Erdogan continue; 1147dec214d0STahsin Erdogan } 1148dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1149dec214d0STahsin Erdogan if (err) 1150dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "cleanup dec ref error %d", 1151dec214d0STahsin Erdogan err); 1152dec214d0STahsin Erdogan iput(ea_inode); 1153dec214d0STahsin Erdogan } 1154dec214d0STahsin Erdogan return saved_err; 1155dec214d0STahsin Erdogan } 1156dec214d0STahsin Erdogan 1157a4130367SJan Kara static int ext4_xattr_restart_fn(handle_t *handle, struct inode *inode, 1158a4130367SJan Kara struct buffer_head *bh, bool block_csum, bool dirty) 1159a4130367SJan Kara { 1160a4130367SJan Kara int error; 1161a4130367SJan Kara 1162a4130367SJan Kara if (bh && dirty) { 1163a4130367SJan Kara if (block_csum) 1164a4130367SJan Kara ext4_xattr_block_csum_set(inode, bh); 1165a4130367SJan Kara error = ext4_handle_dirty_metadata(handle, NULL, bh); 1166a4130367SJan Kara if (error) { 1167a4130367SJan Kara ext4_warning(inode->i_sb, "Handle metadata (error %d)", 1168a4130367SJan Kara error); 1169a4130367SJan Kara return error; 1170a4130367SJan Kara } 1171a4130367SJan Kara } 1172a4130367SJan Kara return 0; 1173a4130367SJan Kara } 1174a4130367SJan Kara 117530a7eb97STahsin Erdogan static void 1176dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent, 117730a7eb97STahsin Erdogan struct buffer_head *bh, 117830a7eb97STahsin Erdogan struct ext4_xattr_entry *first, bool block_csum, 117930a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1180dec214d0STahsin Erdogan int extra_credits, bool skip_quota) 118130a7eb97STahsin Erdogan { 118230a7eb97STahsin Erdogan struct inode *ea_inode; 118330a7eb97STahsin Erdogan struct ext4_xattr_entry *entry; 118430a7eb97STahsin Erdogan bool dirty = false; 118530a7eb97STahsin Erdogan unsigned int ea_ino; 118630a7eb97STahsin Erdogan int err; 118730a7eb97STahsin Erdogan int credits; 118830a7eb97STahsin Erdogan 118930a7eb97STahsin Erdogan /* One credit for dec ref on ea_inode, one for orphan list addition, */ 119030a7eb97STahsin Erdogan credits = 2 + extra_credits; 119130a7eb97STahsin Erdogan 119230a7eb97STahsin Erdogan for (entry = first; !IS_LAST_ENTRY(entry); 119330a7eb97STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 119430a7eb97STahsin Erdogan if (!entry->e_value_inum) 119530a7eb97STahsin Erdogan continue; 119630a7eb97STahsin Erdogan ea_ino = le32_to_cpu(entry->e_value_inum); 1197a6d05676STahsin Erdogan err = ext4_xattr_inode_iget(parent, ea_ino, 1198a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 1199a6d05676STahsin Erdogan &ea_inode); 120030a7eb97STahsin Erdogan if (err) 120130a7eb97STahsin Erdogan continue; 120230a7eb97STahsin Erdogan 120330a7eb97STahsin Erdogan err = ext4_expand_inode_array(ea_inode_array, ea_inode); 120430a7eb97STahsin Erdogan if (err) { 120530a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, 120630a7eb97STahsin Erdogan "Expand inode array err=%d", err); 120730a7eb97STahsin Erdogan iput(ea_inode); 120830a7eb97STahsin Erdogan continue; 120930a7eb97STahsin Erdogan } 121030a7eb97STahsin Erdogan 1211a4130367SJan Kara err = ext4_journal_ensure_credits_fn(handle, credits, credits, 121283448bdfSJan Kara ext4_free_metadata_revoke_credits(parent->i_sb, 1), 1213a4130367SJan Kara ext4_xattr_restart_fn(handle, parent, bh, block_csum, 1214a4130367SJan Kara dirty)); 1215a4130367SJan Kara if (err < 0) { 121630a7eb97STahsin Erdogan ext4_warning_inode(ea_inode, "Ensure credits err=%d", 121730a7eb97STahsin Erdogan err); 121830a7eb97STahsin Erdogan continue; 121930a7eb97STahsin Erdogan } 1220a4130367SJan Kara if (err > 0) { 1221188c299eSJan Kara err = ext4_journal_get_write_access(handle, 1222188c299eSJan Kara parent->i_sb, bh, EXT4_JTR_NONE); 1223a4130367SJan Kara if (err) { 1224a4130367SJan Kara ext4_warning_inode(ea_inode, 1225a4130367SJan Kara "Re-get write access err=%d", 1226a4130367SJan Kara err); 1227a4130367SJan Kara continue; 1228a4130367SJan Kara } 1229a4130367SJan Kara } 123030a7eb97STahsin Erdogan 1231dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, ea_inode); 1232dec214d0STahsin Erdogan if (err) { 1233dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "ea_inode dec ref err=%d", 1234dec214d0STahsin Erdogan err); 1235dec214d0STahsin Erdogan continue; 1236dec214d0STahsin Erdogan } 1237dec214d0STahsin Erdogan 1238dec214d0STahsin Erdogan if (!skip_quota) 1239a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(parent, ea_inode, 1240dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 124130a7eb97STahsin Erdogan 124230a7eb97STahsin Erdogan /* 124330a7eb97STahsin Erdogan * Forget about ea_inode within the same transaction that 124430a7eb97STahsin Erdogan * decrements the ref count. This avoids duplicate decrements in 124530a7eb97STahsin Erdogan * case the rest of the work spills over to subsequent 124630a7eb97STahsin Erdogan * transactions. 124730a7eb97STahsin Erdogan */ 124830a7eb97STahsin Erdogan entry->e_value_inum = 0; 124930a7eb97STahsin Erdogan entry->e_value_size = 0; 125030a7eb97STahsin Erdogan 125130a7eb97STahsin Erdogan dirty = true; 125230a7eb97STahsin Erdogan } 125330a7eb97STahsin Erdogan 125430a7eb97STahsin Erdogan if (dirty) { 125530a7eb97STahsin Erdogan /* 125630a7eb97STahsin Erdogan * Note that we are deliberately skipping csum calculation for 125730a7eb97STahsin Erdogan * the final update because we do not expect any journal 125830a7eb97STahsin Erdogan * restarts until xattr block is freed. 125930a7eb97STahsin Erdogan */ 126030a7eb97STahsin Erdogan 126130a7eb97STahsin Erdogan err = ext4_handle_dirty_metadata(handle, NULL, bh); 126230a7eb97STahsin Erdogan if (err) 126330a7eb97STahsin Erdogan ext4_warning_inode(parent, 126430a7eb97STahsin Erdogan "handle dirty metadata err=%d", err); 126530a7eb97STahsin Erdogan } 126630a7eb97STahsin Erdogan } 126730a7eb97STahsin Erdogan 1268ac27a0ecSDave Kleikamp /* 1269ec4cb1aaSJan Kara * Release the xattr block BH: If the reference count is > 1, decrement it; 1270ec4cb1aaSJan Kara * otherwise free the block. 1271ac27a0ecSDave Kleikamp */ 1272ac27a0ecSDave Kleikamp static void 1273617ba13bSMingming Cao ext4_xattr_release_block(handle_t *handle, struct inode *inode, 1274dec214d0STahsin Erdogan struct buffer_head *bh, 1275dec214d0STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 1276dec214d0STahsin Erdogan int extra_credits) 1277ac27a0ecSDave Kleikamp { 127847387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 12796048c64bSAndreas Gruenbacher u32 hash, ref; 12808a2bfdcbSMingming Cao int error = 0; 1281ac27a0ecSDave Kleikamp 12825d601255Sliang xie BUFFER_TRACE(bh, "get_write_access"); 1283188c299eSJan Kara error = ext4_journal_get_write_access(handle, inode->i_sb, bh, 1284188c299eSJan Kara EXT4_JTR_NONE); 12858a2bfdcbSMingming Cao if (error) 12868a2bfdcbSMingming Cao goto out; 12878a2bfdcbSMingming Cao 128865f8b800SJan Kara retry_ref: 12898a2bfdcbSMingming Cao lock_buffer(bh); 12906048c64bSAndreas Gruenbacher hash = le32_to_cpu(BHDR(bh)->h_hash); 12916048c64bSAndreas Gruenbacher ref = le32_to_cpu(BHDR(bh)->h_refcount); 12926048c64bSAndreas Gruenbacher if (ref == 1) { 1293ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=0; freeing"); 129482939d79SJan Kara /* 129582939d79SJan Kara * This must happen under buffer lock for 129682939d79SJan Kara * ext4_xattr_block_set() to reliably detect freed block 129782939d79SJan Kara */ 129865f8b800SJan Kara if (ea_block_cache) { 129965f8b800SJan Kara struct mb_cache_entry *oe; 130065f8b800SJan Kara 130165f8b800SJan Kara oe = mb_cache_entry_delete_or_get(ea_block_cache, hash, 1302cdb7ee4cSTahsin Erdogan bh->b_blocknr); 130365f8b800SJan Kara if (oe) { 130465f8b800SJan Kara unlock_buffer(bh); 130565f8b800SJan Kara mb_cache_entry_wait_unused(oe); 130665f8b800SJan Kara mb_cache_entry_put(ea_block_cache, oe); 130765f8b800SJan Kara goto retry_ref; 130865f8b800SJan Kara } 130965f8b800SJan Kara } 1310ac27a0ecSDave Kleikamp get_bh(bh); 1311ec4cb1aaSJan Kara unlock_buffer(bh); 1312dec214d0STahsin Erdogan 1313dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) 1314dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, bh, 1315dec214d0STahsin Erdogan BFIRST(bh), 1316dec214d0STahsin Erdogan true /* block_csum */, 1317dec214d0STahsin Erdogan ea_inode_array, 1318dec214d0STahsin Erdogan extra_credits, 1319dec214d0STahsin Erdogan true /* skip_quota */); 1320e6362609STheodore Ts'o ext4_free_blocks(handle, inode, bh, 0, 1, 1321e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA | 1322e6362609STheodore Ts'o EXT4_FREE_BLOCKS_FORGET); 1323ac27a0ecSDave Kleikamp } else { 13246048c64bSAndreas Gruenbacher ref--; 13256048c64bSAndreas Gruenbacher BHDR(bh)->h_refcount = cpu_to_le32(ref); 13266048c64bSAndreas Gruenbacher if (ref == EXT4_XATTR_REFCOUNT_MAX - 1) { 13276048c64bSAndreas Gruenbacher struct mb_cache_entry *ce; 13286048c64bSAndreas Gruenbacher 1329cdb7ee4cSTahsin Erdogan if (ea_block_cache) { 133047387409STahsin Erdogan ce = mb_cache_entry_get(ea_block_cache, hash, 13316048c64bSAndreas Gruenbacher bh->b_blocknr); 13326048c64bSAndreas Gruenbacher if (ce) { 1333a44e84a9SJan Kara set_bit(MBE_REUSABLE_B, &ce->e_flags); 133447387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 13356048c64bSAndreas Gruenbacher } 13366048c64bSAndreas Gruenbacher } 1337cdb7ee4cSTahsin Erdogan } 13386048c64bSAndreas Gruenbacher 1339dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bh); 1340ec4cb1aaSJan Kara /* 1341ec4cb1aaSJan Kara * Beware of this ugliness: Releasing of xattr block references 1342ec4cb1aaSJan Kara * from different inodes can race and so we have to protect 1343ec4cb1aaSJan Kara * from a race where someone else frees the block (and releases 1344ec4cb1aaSJan Kara * its journal_head) before we are done dirtying the buffer. In 1345ec4cb1aaSJan Kara * nojournal mode this race is harmless and we actually cannot 1346dac7a4b4STheodore Ts'o * call ext4_handle_dirty_metadata() with locked buffer as 1347ec4cb1aaSJan Kara * that function can call sync_dirty_buffer() so for that case 1348ec4cb1aaSJan Kara * we handle the dirtying after unlocking the buffer. 1349ec4cb1aaSJan Kara */ 1350ec4cb1aaSJan Kara if (ext4_handle_valid(handle)) 1351dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1352c1bb05a6SEric Sandeen unlock_buffer(bh); 1353ec4cb1aaSJan Kara if (!ext4_handle_valid(handle)) 1354dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, bh); 1355ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 13560390131bSFrank Mayhar ext4_handle_sync(handle); 13571231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(inode->i_sb), 1)); 1358ac27a0ecSDave Kleikamp ea_bdebug(bh, "refcount now=%d; releasing", 1359ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bh)->h_refcount)); 1360ac27a0ecSDave Kleikamp } 13618a2bfdcbSMingming Cao out: 13628a2bfdcbSMingming Cao ext4_std_error(inode->i_sb, error); 13638a2bfdcbSMingming Cao return; 1364ac27a0ecSDave Kleikamp } 1365ac27a0ecSDave Kleikamp 13666dd4ee7cSKalpak Shah /* 13676dd4ee7cSKalpak Shah * Find the available free space for EAs. This also returns the total number of 13686dd4ee7cSKalpak Shah * bytes used by EA entries. 13696dd4ee7cSKalpak Shah */ 13706dd4ee7cSKalpak Shah static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last, 13716dd4ee7cSKalpak Shah size_t *min_offs, void *base, int *total) 13726dd4ee7cSKalpak Shah { 13736dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 1374e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 13756dd4ee7cSKalpak Shah size_t offs = le16_to_cpu(last->e_value_offs); 13766dd4ee7cSKalpak Shah if (offs < *min_offs) 13776dd4ee7cSKalpak Shah *min_offs = offs; 13786dd4ee7cSKalpak Shah } 13797b1b2c1bSTheodore Ts'o if (total) 13807b1b2c1bSTheodore Ts'o *total += EXT4_XATTR_LEN(last->e_name_len); 13816dd4ee7cSKalpak Shah } 13826dd4ee7cSKalpak Shah return (*min_offs - ((void *)last - base) - sizeof(__u32)); 13836dd4ee7cSKalpak Shah } 13846dd4ee7cSKalpak Shah 1385e50e5129SAndreas Dilger /* 1386e50e5129SAndreas Dilger * Write the value of the EA in an inode. 1387e50e5129SAndreas Dilger */ 1388e50e5129SAndreas Dilger static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, 1389e50e5129SAndreas Dilger const void *buf, int bufsize) 1390e50e5129SAndreas Dilger { 1391e50e5129SAndreas Dilger struct buffer_head *bh = NULL; 1392e50e5129SAndreas Dilger unsigned long block = 0; 1393dec214d0STahsin Erdogan int blocksize = ea_inode->i_sb->s_blocksize; 1394dec214d0STahsin Erdogan int max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits; 1395e50e5129SAndreas Dilger int csize, wsize = 0; 13964209ae12SHarshad Shirwadkar int ret = 0, ret2 = 0; 1397e50e5129SAndreas Dilger int retries = 0; 1398e50e5129SAndreas Dilger 1399e50e5129SAndreas Dilger retry: 1400e50e5129SAndreas Dilger while (ret >= 0 && ret < max_blocks) { 1401e50e5129SAndreas Dilger struct ext4_map_blocks map; 1402e50e5129SAndreas Dilger map.m_lblk = block += ret; 1403e50e5129SAndreas Dilger map.m_len = max_blocks -= ret; 1404e50e5129SAndreas Dilger 1405e50e5129SAndreas Dilger ret = ext4_map_blocks(handle, ea_inode, &map, 1406e50e5129SAndreas Dilger EXT4_GET_BLOCKS_CREATE); 1407e50e5129SAndreas Dilger if (ret <= 0) { 1408e50e5129SAndreas Dilger ext4_mark_inode_dirty(handle, ea_inode); 1409e50e5129SAndreas Dilger if (ret == -ENOSPC && 1410e50e5129SAndreas Dilger ext4_should_retry_alloc(ea_inode->i_sb, &retries)) { 1411e50e5129SAndreas Dilger ret = 0; 1412e50e5129SAndreas Dilger goto retry; 1413e50e5129SAndreas Dilger } 1414e50e5129SAndreas Dilger break; 1415e50e5129SAndreas Dilger } 1416e50e5129SAndreas Dilger } 1417e50e5129SAndreas Dilger 1418e50e5129SAndreas Dilger if (ret < 0) 1419e50e5129SAndreas Dilger return ret; 1420e50e5129SAndreas Dilger 1421e50e5129SAndreas Dilger block = 0; 1422e50e5129SAndreas Dilger while (wsize < bufsize) { 1423e50e5129SAndreas Dilger brelse(bh); 1424e50e5129SAndreas Dilger csize = (bufsize - wsize) > blocksize ? blocksize : 1425e50e5129SAndreas Dilger bufsize - wsize; 1426e50e5129SAndreas Dilger bh = ext4_getblk(handle, ea_inode, block, 0); 1427e50e5129SAndreas Dilger if (IS_ERR(bh)) 1428e50e5129SAndreas Dilger return PTR_ERR(bh); 1429eb6984faSVasily Averin if (!bh) { 1430eb6984faSVasily Averin WARN_ON_ONCE(1); 1431eb6984faSVasily Averin EXT4_ERROR_INODE(ea_inode, 1432eb6984faSVasily Averin "ext4_getblk() return bh = NULL"); 1433eb6984faSVasily Averin return -EFSCORRUPTED; 1434eb6984faSVasily Averin } 1435188c299eSJan Kara ret = ext4_journal_get_write_access(handle, ea_inode->i_sb, bh, 1436188c299eSJan Kara EXT4_JTR_NONE); 1437e50e5129SAndreas Dilger if (ret) 1438e50e5129SAndreas Dilger goto out; 1439e50e5129SAndreas Dilger 1440e50e5129SAndreas Dilger memcpy(bh->b_data, buf, csize); 1441e50e5129SAndreas Dilger set_buffer_uptodate(bh); 1442e50e5129SAndreas Dilger ext4_handle_dirty_metadata(handle, ea_inode, bh); 1443e50e5129SAndreas Dilger 1444e50e5129SAndreas Dilger buf += csize; 1445e50e5129SAndreas Dilger wsize += csize; 1446e50e5129SAndreas Dilger block += 1; 1447e50e5129SAndreas Dilger } 1448e50e5129SAndreas Dilger 1449e50e5129SAndreas Dilger inode_lock(ea_inode); 1450e50e5129SAndreas Dilger i_size_write(ea_inode, wsize); 1451e50e5129SAndreas Dilger ext4_update_i_disksize(ea_inode, wsize); 1452e50e5129SAndreas Dilger inode_unlock(ea_inode); 1453e50e5129SAndreas Dilger 14544209ae12SHarshad Shirwadkar ret2 = ext4_mark_inode_dirty(handle, ea_inode); 14554209ae12SHarshad Shirwadkar if (unlikely(ret2 && !ret)) 14564209ae12SHarshad Shirwadkar ret = ret2; 1457e50e5129SAndreas Dilger 1458e50e5129SAndreas Dilger out: 1459e50e5129SAndreas Dilger brelse(bh); 1460e50e5129SAndreas Dilger 1461e50e5129SAndreas Dilger return ret; 1462e50e5129SAndreas Dilger } 1463e50e5129SAndreas Dilger 1464e50e5129SAndreas Dilger /* 1465e50e5129SAndreas Dilger * Create an inode to store the value of a large EA. 1466e50e5129SAndreas Dilger */ 1467e50e5129SAndreas Dilger static struct inode *ext4_xattr_inode_create(handle_t *handle, 1468dec214d0STahsin Erdogan struct inode *inode, u32 hash) 1469e50e5129SAndreas Dilger { 1470e50e5129SAndreas Dilger struct inode *ea_inode = NULL; 14719e1ba001STahsin Erdogan uid_t owner[2] = { i_uid_read(inode), i_gid_read(inode) }; 1472bd3b963bSTahsin Erdogan int err; 1473e50e5129SAndreas Dilger 1474e50e5129SAndreas Dilger /* 1475e50e5129SAndreas Dilger * Let the next inode be the goal, so we try and allocate the EA inode 1476e50e5129SAndreas Dilger * in the same group, or nearby one. 1477e50e5129SAndreas Dilger */ 1478e50e5129SAndreas Dilger ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode, 14799e1ba001STahsin Erdogan S_IFREG | 0600, NULL, inode->i_ino + 1, owner, 14801b917ed8STahsin Erdogan EXT4_EA_INODE_FL); 1481e50e5129SAndreas Dilger if (!IS_ERR(ea_inode)) { 1482e50e5129SAndreas Dilger ea_inode->i_op = &ext4_file_inode_operations; 1483e50e5129SAndreas Dilger ea_inode->i_fop = &ext4_file_operations; 1484e50e5129SAndreas Dilger ext4_set_aops(ea_inode); 148533d201e0STahsin Erdogan ext4_xattr_inode_set_class(ea_inode); 1486e50e5129SAndreas Dilger unlock_new_inode(ea_inode); 1487dec214d0STahsin Erdogan ext4_xattr_inode_set_ref(ea_inode, 1); 1488dec214d0STahsin Erdogan ext4_xattr_inode_set_hash(ea_inode, hash); 1489dec214d0STahsin Erdogan err = ext4_mark_inode_dirty(handle, ea_inode); 1490dec214d0STahsin Erdogan if (!err) 1491bd3b963bSTahsin Erdogan err = ext4_inode_attach_jinode(ea_inode); 1492bd3b963bSTahsin Erdogan if (err) { 1493e4db04f7SYe Bin if (ext4_xattr_inode_dec_ref(handle, ea_inode)) 1494e4db04f7SYe Bin ext4_warning_inode(ea_inode, 1495e4db04f7SYe Bin "cleanup dec ref error %d", err); 1496bd3b963bSTahsin Erdogan iput(ea_inode); 1497bd3b963bSTahsin Erdogan return ERR_PTR(err); 1498bd3b963bSTahsin Erdogan } 1499dec214d0STahsin Erdogan 1500dec214d0STahsin Erdogan /* 1501dec214d0STahsin Erdogan * Xattr inodes are shared therefore quota charging is performed 1502dec214d0STahsin Erdogan * at a higher level. 1503dec214d0STahsin Erdogan */ 1504dec214d0STahsin Erdogan dquot_free_inode(ea_inode); 1505dec214d0STahsin Erdogan dquot_drop(ea_inode); 1506dec214d0STahsin Erdogan inode_lock(ea_inode); 1507dec214d0STahsin Erdogan ea_inode->i_flags |= S_NOQUOTA; 1508dec214d0STahsin Erdogan inode_unlock(ea_inode); 1509e50e5129SAndreas Dilger } 1510e50e5129SAndreas Dilger 1511e50e5129SAndreas Dilger return ea_inode; 1512e50e5129SAndreas Dilger } 1513e50e5129SAndreas Dilger 1514dec214d0STahsin Erdogan static struct inode * 1515dec214d0STahsin Erdogan ext4_xattr_inode_cache_find(struct inode *inode, const void *value, 1516dec214d0STahsin Erdogan size_t value_len, u32 hash) 1517e50e5129SAndreas Dilger { 1518dec214d0STahsin Erdogan struct inode *ea_inode; 1519dec214d0STahsin Erdogan struct mb_cache_entry *ce; 1520dec214d0STahsin Erdogan struct mb_cache *ea_inode_cache = EA_INODE_CACHE(inode); 1521dec214d0STahsin Erdogan void *ea_data; 1522e50e5129SAndreas Dilger 1523cdb7ee4cSTahsin Erdogan if (!ea_inode_cache) 1524cdb7ee4cSTahsin Erdogan return NULL; 1525cdb7ee4cSTahsin Erdogan 1526dec214d0STahsin Erdogan ce = mb_cache_entry_find_first(ea_inode_cache, hash); 1527dec214d0STahsin Erdogan if (!ce) 1528dec214d0STahsin Erdogan return NULL; 1529e50e5129SAndreas Dilger 1530163f0ec1SJan Kara WARN_ON_ONCE(ext4_handle_valid(journal_current_handle()) && 1531163f0ec1SJan Kara !(current->flags & PF_MEMALLOC_NOFS)); 1532163f0ec1SJan Kara 153371b565ceSTheodore Ts'o ea_data = kvmalloc(value_len, GFP_KERNEL); 1534dec214d0STahsin Erdogan if (!ea_data) { 1535dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1536dec214d0STahsin Erdogan return NULL; 1537dec214d0STahsin Erdogan } 1538dec214d0STahsin Erdogan 1539dec214d0STahsin Erdogan while (ce) { 15408a363970STheodore Ts'o ea_inode = ext4_iget(inode->i_sb, ce->e_value, 15418a363970STheodore Ts'o EXT4_IGET_NORMAL); 1542dec214d0STahsin Erdogan if (!IS_ERR(ea_inode) && 1543dec214d0STahsin Erdogan !is_bad_inode(ea_inode) && 1544dec214d0STahsin Erdogan (EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL) && 1545dec214d0STahsin Erdogan i_size_read(ea_inode) == value_len && 1546dec214d0STahsin Erdogan !ext4_xattr_inode_read(ea_inode, ea_data, value_len) && 1547b9fc761eSTahsin Erdogan !ext4_xattr_inode_verify_hashes(ea_inode, NULL, ea_data, 1548dec214d0STahsin Erdogan value_len) && 1549dec214d0STahsin Erdogan !memcmp(value, ea_data, value_len)) { 1550dec214d0STahsin Erdogan mb_cache_entry_touch(ea_inode_cache, ce); 1551dec214d0STahsin Erdogan mb_cache_entry_put(ea_inode_cache, ce); 1552dec214d0STahsin Erdogan kvfree(ea_data); 1553dec214d0STahsin Erdogan return ea_inode; 1554dec214d0STahsin Erdogan } 1555dec214d0STahsin Erdogan 1556dec214d0STahsin Erdogan if (!IS_ERR(ea_inode)) 1557e50e5129SAndreas Dilger iput(ea_inode); 1558dec214d0STahsin Erdogan ce = mb_cache_entry_find_next(ea_inode_cache, ce); 1559dec214d0STahsin Erdogan } 1560dec214d0STahsin Erdogan kvfree(ea_data); 1561dec214d0STahsin Erdogan return NULL; 1562e50e5129SAndreas Dilger } 1563e50e5129SAndreas Dilger 1564e50e5129SAndreas Dilger /* 1565e50e5129SAndreas Dilger * Add value of the EA in an inode. 1566e50e5129SAndreas Dilger */ 1567dec214d0STahsin Erdogan static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, 1568dec214d0STahsin Erdogan const void *value, size_t value_len, 1569dec214d0STahsin Erdogan struct inode **ret_inode) 1570e50e5129SAndreas Dilger { 1571e50e5129SAndreas Dilger struct inode *ea_inode; 1572dec214d0STahsin Erdogan u32 hash; 1573e50e5129SAndreas Dilger int err; 1574e50e5129SAndreas Dilger 1575dec214d0STahsin Erdogan hash = ext4_xattr_inode_hash(EXT4_SB(inode->i_sb), value, value_len); 1576dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_cache_find(inode, value, value_len, hash); 1577dec214d0STahsin Erdogan if (ea_inode) { 1578dec214d0STahsin Erdogan err = ext4_xattr_inode_inc_ref(handle, ea_inode); 1579dec214d0STahsin Erdogan if (err) { 1580dec214d0STahsin Erdogan iput(ea_inode); 1581dec214d0STahsin Erdogan return err; 1582dec214d0STahsin Erdogan } 1583dec214d0STahsin Erdogan 1584dec214d0STahsin Erdogan *ret_inode = ea_inode; 1585dec214d0STahsin Erdogan return 0; 1586dec214d0STahsin Erdogan } 1587dec214d0STahsin Erdogan 1588e50e5129SAndreas Dilger /* Create an inode for the EA value */ 1589dec214d0STahsin Erdogan ea_inode = ext4_xattr_inode_create(handle, inode, hash); 1590e50e5129SAndreas Dilger if (IS_ERR(ea_inode)) 1591e50e5129SAndreas Dilger return PTR_ERR(ea_inode); 1592e50e5129SAndreas Dilger 1593e50e5129SAndreas Dilger err = ext4_xattr_inode_write(handle, ea_inode, value, value_len); 1594dec214d0STahsin Erdogan if (err) { 159556d0d0b9SLi Zhong if (ext4_xattr_inode_dec_ref(handle, ea_inode)) 159656d0d0b9SLi Zhong ext4_warning_inode(ea_inode, "cleanup dec ref error %d", err); 1597e50e5129SAndreas Dilger iput(ea_inode); 1598e50e5129SAndreas Dilger return err; 1599e50e5129SAndreas Dilger } 1600e50e5129SAndreas Dilger 1601cdb7ee4cSTahsin Erdogan if (EA_INODE_CACHE(inode)) 1602dec214d0STahsin Erdogan mb_cache_entry_create(EA_INODE_CACHE(inode), GFP_NOFS, hash, 1603dec214d0STahsin Erdogan ea_inode->i_ino, true /* reusable */); 1604dec214d0STahsin Erdogan 1605dec214d0STahsin Erdogan *ret_inode = ea_inode; 1606dec214d0STahsin Erdogan return 0; 1607dec214d0STahsin Erdogan } 1608dec214d0STahsin Erdogan 16099c6e7853STahsin Erdogan /* 16109c6e7853STahsin Erdogan * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode 16119c6e7853STahsin Erdogan * feature is enabled. 16129c6e7853STahsin Erdogan */ 16139c6e7853STahsin Erdogan #define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) 16149c6e7853STahsin Erdogan 1615e50e5129SAndreas Dilger static int ext4_xattr_set_entry(struct ext4_xattr_info *i, 1616e50e5129SAndreas Dilger struct ext4_xattr_search *s, 1617daf83281STahsin Erdogan handle_t *handle, struct inode *inode, 1618daf83281STahsin Erdogan bool is_block) 1619ac27a0ecSDave Kleikamp { 16205369a762STheodore Ts'o struct ext4_xattr_entry *last, *next; 1621dec214d0STahsin Erdogan struct ext4_xattr_entry *here = s->here; 1622dec214d0STahsin Erdogan size_t min_offs = s->end - s->base, name_len = strlen(i->name); 1623e50e5129SAndreas Dilger int in_inode = i->in_inode; 1624dec214d0STahsin Erdogan struct inode *old_ea_inode = NULL; 1625dec214d0STahsin Erdogan struct inode *new_ea_inode = NULL; 1626dec214d0STahsin Erdogan size_t old_size, new_size; 1627dec214d0STahsin Erdogan int ret; 1628dec214d0STahsin Erdogan 1629dec214d0STahsin Erdogan /* Space used by old and new values. */ 1630dec214d0STahsin Erdogan old_size = (!s->not_found && !here->e_value_inum) ? 1631dec214d0STahsin Erdogan EXT4_XATTR_SIZE(le32_to_cpu(here->e_value_size)) : 0; 1632dec214d0STahsin Erdogan new_size = (i->value && !in_inode) ? EXT4_XATTR_SIZE(i->value_len) : 0; 1633dec214d0STahsin Erdogan 1634dec214d0STahsin Erdogan /* 1635dec214d0STahsin Erdogan * Optimization for the simple case when old and new values have the 1636dec214d0STahsin Erdogan * same padded sizes. Not applicable if external inodes are involved. 1637dec214d0STahsin Erdogan */ 1638dec214d0STahsin Erdogan if (new_size && new_size == old_size) { 1639dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1640dec214d0STahsin Erdogan void *val = s->base + offs; 1641dec214d0STahsin Erdogan 1642dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1643dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1644dec214d0STahsin Erdogan memset(val, 0, new_size); 1645dec214d0STahsin Erdogan } else { 1646dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1647dec214d0STahsin Erdogan /* Clear padding bytes. */ 1648dec214d0STahsin Erdogan memset(val + i->value_len, 0, new_size - i->value_len); 1649dec214d0STahsin Erdogan } 165032aaf194STahsin Erdogan goto update_hash; 1651dec214d0STahsin Erdogan } 1652e50e5129SAndreas Dilger 1653ac27a0ecSDave Kleikamp /* Compute min_offs and last. */ 1654ac27a0ecSDave Kleikamp last = s->first; 16555369a762STheodore Ts'o for (; !IS_LAST_ENTRY(last); last = next) { 16565369a762STheodore Ts'o next = EXT4_XATTR_NEXT(last); 16575369a762STheodore Ts'o if ((void *)next >= s->end) { 16585369a762STheodore Ts'o EXT4_ERROR_INODE(inode, "corrupted xattr entries"); 16595369a762STheodore Ts'o ret = -EFSCORRUPTED; 16605369a762STheodore Ts'o goto out; 16615369a762STheodore Ts'o } 1662e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 1663ac27a0ecSDave Kleikamp size_t offs = le16_to_cpu(last->e_value_offs); 1664ac27a0ecSDave Kleikamp if (offs < min_offs) 1665ac27a0ecSDave Kleikamp min_offs = offs; 1666ac27a0ecSDave Kleikamp } 1667ac27a0ecSDave Kleikamp } 1668dec214d0STahsin Erdogan 1669dec214d0STahsin Erdogan /* Check whether we have enough space. */ 1670ac27a0ecSDave Kleikamp if (i->value) { 1671dec214d0STahsin Erdogan size_t free; 1672e50e5129SAndreas Dilger 1673dec214d0STahsin Erdogan free = min_offs - ((void *)last - s->base) - sizeof(__u32); 1674dec214d0STahsin Erdogan if (!s->not_found) 1675dec214d0STahsin Erdogan free += EXT4_XATTR_LEN(name_len) + old_size; 1676e50e5129SAndreas Dilger 1677dec214d0STahsin Erdogan if (free < EXT4_XATTR_LEN(name_len) + new_size) { 1678dec214d0STahsin Erdogan ret = -ENOSPC; 1679dec214d0STahsin Erdogan goto out; 1680dec214d0STahsin Erdogan } 16819c6e7853STahsin Erdogan 16829c6e7853STahsin Erdogan /* 16839c6e7853STahsin Erdogan * If storing the value in an external inode is an option, 16849c6e7853STahsin Erdogan * reserve space for xattr entries/names in the external 16859c6e7853STahsin Erdogan * attribute block so that a long value does not occupy the 16863088e5a5SBhaskar Chowdhury * whole space and prevent further entries being added. 16879c6e7853STahsin Erdogan */ 1688daf83281STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 1689daf83281STahsin Erdogan new_size && is_block && 16909c6e7853STahsin Erdogan (min_offs + old_size - new_size) < 16919c6e7853STahsin Erdogan EXT4_XATTR_BLOCK_RESERVE(inode)) { 16929c6e7853STahsin Erdogan ret = -ENOSPC; 16939c6e7853STahsin Erdogan goto out; 16949c6e7853STahsin Erdogan } 1695ac27a0ecSDave Kleikamp } 1696ac27a0ecSDave Kleikamp 1697dec214d0STahsin Erdogan /* 1698dec214d0STahsin Erdogan * Getting access to old and new ea inodes is subject to failures. 1699dec214d0STahsin Erdogan * Finish that work before doing any modifications to the xattr data. 1700dec214d0STahsin Erdogan */ 1701dec214d0STahsin Erdogan if (!s->not_found && here->e_value_inum) { 1702dec214d0STahsin Erdogan ret = ext4_xattr_inode_iget(inode, 1703dec214d0STahsin Erdogan le32_to_cpu(here->e_value_inum), 1704a6d05676STahsin Erdogan le32_to_cpu(here->e_hash), 1705dec214d0STahsin Erdogan &old_ea_inode); 1706dec214d0STahsin Erdogan if (ret) { 1707dec214d0STahsin Erdogan old_ea_inode = NULL; 1708dec214d0STahsin Erdogan goto out; 1709bd9926e8STheodore Ts'o } 1710dec214d0STahsin Erdogan } 1711dec214d0STahsin Erdogan if (i->value && in_inode) { 1712dec214d0STahsin Erdogan WARN_ON_ONCE(!i->value_len); 1713dec214d0STahsin Erdogan 1714dec214d0STahsin Erdogan ret = ext4_xattr_inode_alloc_quota(inode, i->value_len); 1715dec214d0STahsin Erdogan if (ret) 1716dec214d0STahsin Erdogan goto out; 1717dec214d0STahsin Erdogan 1718dec214d0STahsin Erdogan ret = ext4_xattr_inode_lookup_create(handle, inode, i->value, 1719dec214d0STahsin Erdogan i->value_len, 1720dec214d0STahsin Erdogan &new_ea_inode); 1721dec214d0STahsin Erdogan if (ret) { 1722dec214d0STahsin Erdogan new_ea_inode = NULL; 1723a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, i->value_len); 1724dec214d0STahsin Erdogan goto out; 1725dec214d0STahsin Erdogan } 1726ac27a0ecSDave Kleikamp } 1727ac27a0ecSDave Kleikamp 1728dec214d0STahsin Erdogan if (old_ea_inode) { 1729dec214d0STahsin Erdogan /* We are ready to release ref count on the old_ea_inode. */ 1730dec214d0STahsin Erdogan ret = ext4_xattr_inode_dec_ref(handle, old_ea_inode); 1731dec214d0STahsin Erdogan if (ret) { 1732dec214d0STahsin Erdogan /* Release newly required ref count on new_ea_inode. */ 1733dec214d0STahsin Erdogan if (new_ea_inode) { 1734dec214d0STahsin Erdogan int err; 1735dec214d0STahsin Erdogan 1736dec214d0STahsin Erdogan err = ext4_xattr_inode_dec_ref(handle, 1737dec214d0STahsin Erdogan new_ea_inode); 1738dec214d0STahsin Erdogan if (err) 1739dec214d0STahsin Erdogan ext4_warning_inode(new_ea_inode, 1740dec214d0STahsin Erdogan "dec ref new_ea_inode err=%d", 1741dec214d0STahsin Erdogan err); 1742a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, new_ea_inode, 1743dec214d0STahsin Erdogan i->value_len); 1744dec214d0STahsin Erdogan } 1745dec214d0STahsin Erdogan goto out; 1746dec214d0STahsin Erdogan } 1747dec214d0STahsin Erdogan 1748a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, old_ea_inode, 1749dec214d0STahsin Erdogan le32_to_cpu(here->e_value_size)); 1750dec214d0STahsin Erdogan } 1751dec214d0STahsin Erdogan 1752dec214d0STahsin Erdogan /* No failures allowed past this point. */ 1753dec214d0STahsin Erdogan 1754e5d01196STheodore Ts'o if (!s->not_found && here->e_value_size && !here->e_value_inum) { 1755ac27a0ecSDave Kleikamp /* Remove the old value. */ 1756dec214d0STahsin Erdogan void *first_val = s->base + min_offs; 1757dec214d0STahsin Erdogan size_t offs = le16_to_cpu(here->e_value_offs); 1758dec214d0STahsin Erdogan void *val = s->base + offs; 1759dec214d0STahsin Erdogan 1760dec214d0STahsin Erdogan memmove(first_val + old_size, first_val, val - first_val); 1761dec214d0STahsin Erdogan memset(first_val, 0, old_size); 1762dec214d0STahsin Erdogan min_offs += old_size; 1763ac27a0ecSDave Kleikamp 1764ac27a0ecSDave Kleikamp /* Adjust all value offsets. */ 1765ac27a0ecSDave Kleikamp last = s->first; 1766ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(last)) { 1767ac27a0ecSDave Kleikamp size_t o = le16_to_cpu(last->e_value_offs); 1768dec214d0STahsin Erdogan 1769e50e5129SAndreas Dilger if (!last->e_value_inum && 1770e50e5129SAndreas Dilger last->e_value_size && o < offs) 1771dec214d0STahsin Erdogan last->e_value_offs = cpu_to_le16(o + old_size); 1772617ba13bSMingming Cao last = EXT4_XATTR_NEXT(last); 1773ac27a0ecSDave Kleikamp } 1774ac27a0ecSDave Kleikamp } 1775dec214d0STahsin Erdogan 1776ac27a0ecSDave Kleikamp if (!i->value) { 1777dec214d0STahsin Erdogan /* Remove old name. */ 1778617ba13bSMingming Cao size_t size = EXT4_XATTR_LEN(name_len); 1779dec214d0STahsin Erdogan 1780ac27a0ecSDave Kleikamp last = ENTRY((void *)last - size); 1781dec214d0STahsin Erdogan memmove(here, (void *)here + size, 1782dec214d0STahsin Erdogan (void *)last - (void *)here + sizeof(__u32)); 1783ac27a0ecSDave Kleikamp memset(last, 0, size); 1784dec214d0STahsin Erdogan } else if (s->not_found) { 1785dec214d0STahsin Erdogan /* Insert new name. */ 1786dec214d0STahsin Erdogan size_t size = EXT4_XATTR_LEN(name_len); 1787dec214d0STahsin Erdogan size_t rest = (void *)last - (void *)here + sizeof(__u32); 1788dec214d0STahsin Erdogan 1789dec214d0STahsin Erdogan memmove((void *)here + size, here, rest); 1790dec214d0STahsin Erdogan memset(here, 0, size); 1791dec214d0STahsin Erdogan here->e_name_index = i->name_index; 1792dec214d0STahsin Erdogan here->e_name_len = name_len; 1793dec214d0STahsin Erdogan memcpy(here->e_name, i->name, name_len); 1794dec214d0STahsin Erdogan } else { 1795dec214d0STahsin Erdogan /* This is an update, reset value info. */ 1796dec214d0STahsin Erdogan here->e_value_inum = 0; 1797dec214d0STahsin Erdogan here->e_value_offs = 0; 1798dec214d0STahsin Erdogan here->e_value_size = 0; 1799ac27a0ecSDave Kleikamp } 1800ac27a0ecSDave Kleikamp 1801ac27a0ecSDave Kleikamp if (i->value) { 1802dec214d0STahsin Erdogan /* Insert new value. */ 1803e50e5129SAndreas Dilger if (in_inode) { 1804dec214d0STahsin Erdogan here->e_value_inum = cpu_to_le32(new_ea_inode->i_ino); 1805e50e5129SAndreas Dilger } else if (i->value_len) { 1806dec214d0STahsin Erdogan void *val = s->base + min_offs - new_size; 1807e50e5129SAndreas Dilger 1808dec214d0STahsin Erdogan here->e_value_offs = cpu_to_le16(min_offs - new_size); 1809dec214d0STahsin Erdogan if (i->value == EXT4_ZERO_XATTR_VALUE) { 1810dec214d0STahsin Erdogan memset(val, 0, new_size); 1811dec214d0STahsin Erdogan } else { 1812dec214d0STahsin Erdogan memcpy(val, i->value, i->value_len); 1813dec214d0STahsin Erdogan /* Clear padding bytes. */ 1814dec214d0STahsin Erdogan memset(val + i->value_len, 0, 1815dec214d0STahsin Erdogan new_size - i->value_len); 1816dec214d0STahsin Erdogan } 1817dec214d0STahsin Erdogan } 1818dec214d0STahsin Erdogan here->e_value_size = cpu_to_le32(i->value_len); 1819dec214d0STahsin Erdogan } 1820daf83281STahsin Erdogan 182132aaf194STahsin Erdogan update_hash: 1822b9fc761eSTahsin Erdogan if (i->value) { 1823b9fc761eSTahsin Erdogan __le32 hash = 0; 1824b9fc761eSTahsin Erdogan 1825b9fc761eSTahsin Erdogan /* Entry hash calculation. */ 1826b9fc761eSTahsin Erdogan if (in_inode) { 1827b9fc761eSTahsin Erdogan __le32 crc32c_hash; 1828b9fc761eSTahsin Erdogan 1829b9fc761eSTahsin Erdogan /* 1830b9fc761eSTahsin Erdogan * Feed crc32c hash instead of the raw value for entry 1831b9fc761eSTahsin Erdogan * hash calculation. This is to avoid walking 1832b9fc761eSTahsin Erdogan * potentially long value buffer again. 1833b9fc761eSTahsin Erdogan */ 1834b9fc761eSTahsin Erdogan crc32c_hash = cpu_to_le32( 1835b9fc761eSTahsin Erdogan ext4_xattr_inode_get_hash(new_ea_inode)); 1836b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1837b9fc761eSTahsin Erdogan here->e_name_len, 1838b9fc761eSTahsin Erdogan &crc32c_hash, 1); 1839b9fc761eSTahsin Erdogan } else if (is_block) { 184032aaf194STahsin Erdogan __le32 *value = s->base + le16_to_cpu( 184132aaf194STahsin Erdogan here->e_value_offs); 1842b9fc761eSTahsin Erdogan 1843b9fc761eSTahsin Erdogan hash = ext4_xattr_hash_entry(here->e_name, 1844b9fc761eSTahsin Erdogan here->e_name_len, value, 1845b9fc761eSTahsin Erdogan new_size >> 2); 1846daf83281STahsin Erdogan } 1847b9fc761eSTahsin Erdogan here->e_hash = hash; 1848b9fc761eSTahsin Erdogan } 1849b9fc761eSTahsin Erdogan 1850b9fc761eSTahsin Erdogan if (is_block) 1851b9fc761eSTahsin Erdogan ext4_xattr_rehash((struct ext4_xattr_header *)s->base); 1852daf83281STahsin Erdogan 1853dec214d0STahsin Erdogan ret = 0; 1854e50e5129SAndreas Dilger out: 1855dec214d0STahsin Erdogan iput(old_ea_inode); 1856dec214d0STahsin Erdogan iput(new_ea_inode); 1857dec214d0STahsin Erdogan return ret; 1858ac27a0ecSDave Kleikamp } 1859ac27a0ecSDave Kleikamp 1860617ba13bSMingming Cao struct ext4_xattr_block_find { 1861617ba13bSMingming Cao struct ext4_xattr_search s; 1862ac27a0ecSDave Kleikamp struct buffer_head *bh; 1863ac27a0ecSDave Kleikamp }; 1864ac27a0ecSDave Kleikamp 1865ac27a0ecSDave Kleikamp static int 1866617ba13bSMingming Cao ext4_xattr_block_find(struct inode *inode, struct ext4_xattr_info *i, 1867617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1868ac27a0ecSDave Kleikamp { 1869ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1870ac27a0ecSDave Kleikamp int error; 1871ac27a0ecSDave Kleikamp 1872ac27a0ecSDave Kleikamp ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", 1873ac27a0ecSDave Kleikamp i->name_index, i->name, i->value, (long)i->value_len); 1874ac27a0ecSDave Kleikamp 1875617ba13bSMingming Cao if (EXT4_I(inode)->i_file_acl) { 1876ac27a0ecSDave Kleikamp /* The inode already has an extended attribute block. */ 1877fb265c9cSTheodore Ts'o bs->bh = ext4_sb_bread(sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 18788418897fSJeffle Xu if (IS_ERR(bs->bh)) { 18798418897fSJeffle Xu error = PTR_ERR(bs->bh); 18808418897fSJeffle Xu bs->bh = NULL; 18818418897fSJeffle Xu return error; 18828418897fSJeffle Xu } 1883ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "b_count=%d, refcount=%d", 1884ac27a0ecSDave Kleikamp atomic_read(&(bs->bh->b_count)), 1885ac27a0ecSDave Kleikamp le32_to_cpu(BHDR(bs->bh)->h_refcount)); 1886de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bs->bh); 1887de05ca85STheodore Ts'o if (error) 1888fb265c9cSTheodore Ts'o return error; 1889ac27a0ecSDave Kleikamp /* Find the named attribute. */ 1890ac27a0ecSDave Kleikamp bs->s.base = BHDR(bs->bh); 1891ac27a0ecSDave Kleikamp bs->s.first = BFIRST(bs->bh); 1892ac27a0ecSDave Kleikamp bs->s.end = bs->bh->b_data + bs->bh->b_size; 1893ac27a0ecSDave Kleikamp bs->s.here = bs->s.first; 18949496005dSTheodore Ts'o error = xattr_find_entry(inode, &bs->s.here, bs->s.end, 18959496005dSTheodore Ts'o i->name_index, i->name, 1); 1896ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 1897fb265c9cSTheodore Ts'o return error; 1898ac27a0ecSDave Kleikamp bs->s.not_found = error; 1899ac27a0ecSDave Kleikamp } 1900fb265c9cSTheodore Ts'o return 0; 1901ac27a0ecSDave Kleikamp } 1902ac27a0ecSDave Kleikamp 1903ac27a0ecSDave Kleikamp static int 1904617ba13bSMingming Cao ext4_xattr_block_set(handle_t *handle, struct inode *inode, 1905617ba13bSMingming Cao struct ext4_xattr_info *i, 1906617ba13bSMingming Cao struct ext4_xattr_block_find *bs) 1907ac27a0ecSDave Kleikamp { 1908ac27a0ecSDave Kleikamp struct super_block *sb = inode->i_sb; 1909ac27a0ecSDave Kleikamp struct buffer_head *new_bh = NULL; 1910b347e2bcSTahsin Erdogan struct ext4_xattr_search s_copy = bs->s; 1911b347e2bcSTahsin Erdogan struct ext4_xattr_search *s = &s_copy; 19127a2508e1SJan Kara struct mb_cache_entry *ce = NULL; 19138a2bfdcbSMingming Cao int error = 0; 191447387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 1915a6d05676STahsin Erdogan struct inode *ea_inode = NULL, *tmp_inode; 1916a6d05676STahsin Erdogan size_t old_ea_inode_quota = 0; 1917a6d05676STahsin Erdogan unsigned int ea_ino; 1918a6d05676STahsin Erdogan 1919ac27a0ecSDave Kleikamp 1920617ba13bSMingming Cao #define header(x) ((struct ext4_xattr_header *)(x)) 1921ac27a0ecSDave Kleikamp 1922ac27a0ecSDave Kleikamp if (s->base) { 1923fd48e9acSJan Kara int offset = (char *)s->here - bs->bh->b_data; 1924fd48e9acSJan Kara 19255d601255Sliang xie BUFFER_TRACE(bs->bh, "get_write_access"); 1926188c299eSJan Kara error = ext4_journal_get_write_access(handle, sb, bs->bh, 1927188c299eSJan Kara EXT4_JTR_NONE); 19288a2bfdcbSMingming Cao if (error) 19298a2bfdcbSMingming Cao goto cleanup; 19308a2bfdcbSMingming Cao lock_buffer(bs->bh); 19318a2bfdcbSMingming Cao 1932ac27a0ecSDave Kleikamp if (header(s->base)->h_refcount == cpu_to_le32(1)) { 193382939d79SJan Kara __u32 hash = le32_to_cpu(BHDR(bs->bh)->h_hash); 193482939d79SJan Kara 193582939d79SJan Kara /* 193682939d79SJan Kara * This must happen under buffer lock for 193782939d79SJan Kara * ext4_xattr_block_set() to reliably detect modified 193882939d79SJan Kara * block 193982939d79SJan Kara */ 194065f8b800SJan Kara if (ea_block_cache) { 194165f8b800SJan Kara struct mb_cache_entry *oe; 194265f8b800SJan Kara 194365f8b800SJan Kara oe = mb_cache_entry_delete_or_get(ea_block_cache, 194465f8b800SJan Kara hash, bs->bh->b_blocknr); 194565f8b800SJan Kara if (oe) { 194665f8b800SJan Kara /* 194765f8b800SJan Kara * Xattr block is getting reused. Leave 194865f8b800SJan Kara * it alone. 194965f8b800SJan Kara */ 195065f8b800SJan Kara mb_cache_entry_put(ea_block_cache, oe); 195165f8b800SJan Kara goto clone_block; 195265f8b800SJan Kara } 195365f8b800SJan Kara } 1954ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "modifying in-place"); 1955daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, 1956daf83281STahsin Erdogan true /* is_block */); 1957dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, bs->bh); 1958ac27a0ecSDave Kleikamp unlock_buffer(bs->bh); 19596a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 1960ac27a0ecSDave Kleikamp goto bad_block; 1961ac27a0ecSDave Kleikamp if (!error) 1962dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 19630390131bSFrank Mayhar inode, 1964ac27a0ecSDave Kleikamp bs->bh); 1965ac27a0ecSDave Kleikamp if (error) 1966ac27a0ecSDave Kleikamp goto cleanup; 1967ac27a0ecSDave Kleikamp goto inserted; 1968fd48e9acSJan Kara } 196965f8b800SJan Kara clone_block: 19708a2bfdcbSMingming Cao unlock_buffer(bs->bh); 1971ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "cloning"); 19724efd9f0dSShuqi Zhang s->base = kmemdup(BHDR(bs->bh), bs->bh->b_size, GFP_NOFS); 1973ac27a0ecSDave Kleikamp error = -ENOMEM; 1974ac27a0ecSDave Kleikamp if (s->base == NULL) 1975ac27a0ecSDave Kleikamp goto cleanup; 1976ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 1977ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 1978ac27a0ecSDave Kleikamp s->here = ENTRY(s->base + offset); 1979ac27a0ecSDave Kleikamp s->end = s->base + bs->bh->b_size; 1980dec214d0STahsin Erdogan 1981dec214d0STahsin Erdogan /* 1982dec214d0STahsin Erdogan * If existing entry points to an xattr inode, we need 1983dec214d0STahsin Erdogan * to prevent ext4_xattr_set_entry() from decrementing 1984dec214d0STahsin Erdogan * ref count on it because the reference belongs to the 1985dec214d0STahsin Erdogan * original block. In this case, make the entry look 1986dec214d0STahsin Erdogan * like it has an empty value. 1987dec214d0STahsin Erdogan */ 1988dec214d0STahsin Erdogan if (!s->not_found && s->here->e_value_inum) { 1989a6d05676STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 1990a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 1991a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 1992a6d05676STahsin Erdogan &tmp_inode); 1993a6d05676STahsin Erdogan if (error) 1994a6d05676STahsin Erdogan goto cleanup; 1995a6d05676STahsin Erdogan 1996a6d05676STahsin Erdogan if (!ext4_test_inode_state(tmp_inode, 1997a6d05676STahsin Erdogan EXT4_STATE_LUSTRE_EA_INODE)) { 1998dec214d0STahsin Erdogan /* 1999a6d05676STahsin Erdogan * Defer quota free call for previous 2000a6d05676STahsin Erdogan * inode until success is guaranteed. 2001dec214d0STahsin Erdogan */ 2002a6d05676STahsin Erdogan old_ea_inode_quota = le32_to_cpu( 2003dec214d0STahsin Erdogan s->here->e_value_size); 2004a6d05676STahsin Erdogan } 2005a6d05676STahsin Erdogan iput(tmp_inode); 2006a6d05676STahsin Erdogan 2007dec214d0STahsin Erdogan s->here->e_value_inum = 0; 2008dec214d0STahsin Erdogan s->here->e_value_size = 0; 2009dec214d0STahsin Erdogan } 2010ac27a0ecSDave Kleikamp } else { 2011ac27a0ecSDave Kleikamp /* Allocate a buffer where we construct the new block. */ 2012216553c4SJosef Bacik s->base = kzalloc(sb->s_blocksize, GFP_NOFS); 2013ac27a0ecSDave Kleikamp error = -ENOMEM; 2014ac27a0ecSDave Kleikamp if (s->base == NULL) 2015ac27a0ecSDave Kleikamp goto cleanup; 2016617ba13bSMingming Cao header(s->base)->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 2017ac27a0ecSDave Kleikamp header(s->base)->h_blocks = cpu_to_le32(1); 2018ac27a0ecSDave Kleikamp header(s->base)->h_refcount = cpu_to_le32(1); 2019ac27a0ecSDave Kleikamp s->first = ENTRY(header(s->base)+1); 2020ac27a0ecSDave Kleikamp s->here = ENTRY(header(s->base)+1); 2021ac27a0ecSDave Kleikamp s->end = s->base + sb->s_blocksize; 2022ac27a0ecSDave Kleikamp } 2023ac27a0ecSDave Kleikamp 2024daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, true /* is_block */); 20256a797d27SDarrick J. Wong if (error == -EFSCORRUPTED) 2026ac27a0ecSDave Kleikamp goto bad_block; 2027ac27a0ecSDave Kleikamp if (error) 2028ac27a0ecSDave Kleikamp goto cleanup; 2029dec214d0STahsin Erdogan 2030dec214d0STahsin Erdogan if (i->value && s->here->e_value_inum) { 2031dec214d0STahsin Erdogan /* 2032dec214d0STahsin Erdogan * A ref count on ea_inode has been taken as part of the call to 2033dec214d0STahsin Erdogan * ext4_xattr_set_entry() above. We would like to drop this 2034dec214d0STahsin Erdogan * extra ref but we have to wait until the xattr block is 2035dec214d0STahsin Erdogan * initialized and has its own ref count on the ea_inode. 2036dec214d0STahsin Erdogan */ 2037dec214d0STahsin Erdogan ea_ino = le32_to_cpu(s->here->e_value_inum); 2038a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, ea_ino, 2039a6d05676STahsin Erdogan le32_to_cpu(s->here->e_hash), 2040a6d05676STahsin Erdogan &ea_inode); 2041dec214d0STahsin Erdogan if (error) { 2042dec214d0STahsin Erdogan ea_inode = NULL; 2043dec214d0STahsin Erdogan goto cleanup; 2044dec214d0STahsin Erdogan } 2045dec214d0STahsin Erdogan } 2046dec214d0STahsin Erdogan 2047ac27a0ecSDave Kleikamp inserted: 2048ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 204947387409STahsin Erdogan new_bh = ext4_xattr_block_cache_find(inode, header(s->base), 205047387409STahsin Erdogan &ce); 2051ac27a0ecSDave Kleikamp if (new_bh) { 2052ac27a0ecSDave Kleikamp /* We found an identical block in the cache. */ 2053ac27a0ecSDave Kleikamp if (new_bh == bs->bh) 2054ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "keeping"); 2055ac27a0ecSDave Kleikamp else { 20566048c64bSAndreas Gruenbacher u32 ref; 20576048c64bSAndreas Gruenbacher 2058b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 2059b8cb5a54STahsin Erdogan 2060ac27a0ecSDave Kleikamp /* The old block is released after updating 2061ac27a0ecSDave Kleikamp the inode. */ 20621231b3a1SLukas Czerner error = dquot_alloc_block(inode, 20631231b3a1SLukas Czerner EXT4_C2B(EXT4_SB(sb), 1)); 20645dd4056dSChristoph Hellwig if (error) 2065ac27a0ecSDave Kleikamp goto cleanup; 20665d601255Sliang xie BUFFER_TRACE(new_bh, "get_write_access"); 2067188c299eSJan Kara error = ext4_journal_get_write_access( 2068188c299eSJan Kara handle, sb, new_bh, 2069188c299eSJan Kara EXT4_JTR_NONE); 2070ac27a0ecSDave Kleikamp if (error) 2071ac27a0ecSDave Kleikamp goto cleanup_dquot; 2072ac27a0ecSDave Kleikamp lock_buffer(new_bh); 207382939d79SJan Kara /* 207482939d79SJan Kara * We have to be careful about races with 207565f8b800SJan Kara * adding references to xattr block. Once we 207665f8b800SJan Kara * hold buffer lock xattr block's state is 207765f8b800SJan Kara * stable so we can check the additional 207865f8b800SJan Kara * reference fits. 207982939d79SJan Kara */ 208065f8b800SJan Kara ref = le32_to_cpu(BHDR(new_bh)->h_refcount) + 1; 208165f8b800SJan Kara if (ref > EXT4_XATTR_REFCOUNT_MAX) { 208282939d79SJan Kara /* 208382939d79SJan Kara * Undo everything and check mbcache 208482939d79SJan Kara * again. 208582939d79SJan Kara */ 208682939d79SJan Kara unlock_buffer(new_bh); 208782939d79SJan Kara dquot_free_block(inode, 208882939d79SJan Kara EXT4_C2B(EXT4_SB(sb), 208982939d79SJan Kara 1)); 209082939d79SJan Kara brelse(new_bh); 209147387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 209282939d79SJan Kara ce = NULL; 209382939d79SJan Kara new_bh = NULL; 209482939d79SJan Kara goto inserted; 209582939d79SJan Kara } 20966048c64bSAndreas Gruenbacher BHDR(new_bh)->h_refcount = cpu_to_le32(ref); 209765f8b800SJan Kara if (ref == EXT4_XATTR_REFCOUNT_MAX) 2098a44e84a9SJan Kara clear_bit(MBE_REUSABLE_B, &ce->e_flags); 2099ac27a0ecSDave Kleikamp ea_bdebug(new_bh, "reusing; refcount now=%d", 21006048c64bSAndreas Gruenbacher ref); 2101dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2102ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2103dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, 21040390131bSFrank Mayhar inode, 2105ac27a0ecSDave Kleikamp new_bh); 2106ac27a0ecSDave Kleikamp if (error) 2107ac27a0ecSDave Kleikamp goto cleanup_dquot; 2108ac27a0ecSDave Kleikamp } 210947387409STahsin Erdogan mb_cache_entry_touch(ea_block_cache, ce); 211047387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2111ac27a0ecSDave Kleikamp ce = NULL; 2112ac27a0ecSDave Kleikamp } else if (bs->bh && s->base == bs->bh->b_data) { 2113ac27a0ecSDave Kleikamp /* We were modifying this block in-place. */ 2114ac27a0ecSDave Kleikamp ea_bdebug(bs->bh, "keeping this block"); 2115ec000220STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, bs->bh); 2116ac27a0ecSDave Kleikamp new_bh = bs->bh; 2117ac27a0ecSDave Kleikamp get_bh(new_bh); 2118ac27a0ecSDave Kleikamp } else { 2119ac27a0ecSDave Kleikamp /* We need to allocate a new block */ 2120fb0a387dSEric Sandeen ext4_fsblk_t goal, block; 2121fb0a387dSEric Sandeen 2122b8cb5a54STahsin Erdogan WARN_ON_ONCE(dquot_initialize_needed(inode)); 2123b8cb5a54STahsin Erdogan 2124fb0a387dSEric Sandeen goal = ext4_group_first_block_no(sb, 2125d00a6d7bSAkinobu Mita EXT4_I(inode)->i_block_group); 212655f020dbSAllison Henderson block = ext4_new_meta_blocks(handle, inode, goal, 0, 212755f020dbSAllison Henderson NULL, &error); 2128ac27a0ecSDave Kleikamp if (error) 2129ac27a0ecSDave Kleikamp goto cleanup; 2130fb0a387dSEric Sandeen 2131ace36ad4SJoe Perches ea_idebug(inode, "creating block %llu", 2132ace36ad4SJoe Perches (unsigned long long)block); 2133ac27a0ecSDave Kleikamp 2134ac27a0ecSDave Kleikamp new_bh = sb_getblk(sb, block); 2135aebf0243SWang Shilong if (unlikely(!new_bh)) { 2136860d21e2STheodore Ts'o error = -ENOMEM; 2137ac27a0ecSDave Kleikamp getblk_failed: 21387dc57615SPeter Huewe ext4_free_blocks(handle, inode, NULL, block, 1, 2139e6362609STheodore Ts'o EXT4_FREE_BLOCKS_METADATA); 2140ac27a0ecSDave Kleikamp goto cleanup; 2141ac27a0ecSDave Kleikamp } 2142dec214d0STahsin Erdogan error = ext4_xattr_inode_inc_ref_all(handle, inode, 2143dec214d0STahsin Erdogan ENTRY(header(s->base)+1)); 2144dec214d0STahsin Erdogan if (error) 2145dec214d0STahsin Erdogan goto getblk_failed; 2146dec214d0STahsin Erdogan if (ea_inode) { 2147dec214d0STahsin Erdogan /* Drop the extra ref on ea_inode. */ 2148dec214d0STahsin Erdogan error = ext4_xattr_inode_dec_ref(handle, 2149dec214d0STahsin Erdogan ea_inode); 2150dec214d0STahsin Erdogan if (error) 2151dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, 2152dec214d0STahsin Erdogan "dec ref error=%d", 2153dec214d0STahsin Erdogan error); 2154dec214d0STahsin Erdogan iput(ea_inode); 2155dec214d0STahsin Erdogan ea_inode = NULL; 2156dec214d0STahsin Erdogan } 2157dec214d0STahsin Erdogan 2158ac27a0ecSDave Kleikamp lock_buffer(new_bh); 2159188c299eSJan Kara error = ext4_journal_get_create_access(handle, sb, 2160188c299eSJan Kara new_bh, EXT4_JTR_NONE); 2161ac27a0ecSDave Kleikamp if (error) { 2162ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 2163860d21e2STheodore Ts'o error = -EIO; 2164ac27a0ecSDave Kleikamp goto getblk_failed; 2165ac27a0ecSDave Kleikamp } 2166ac27a0ecSDave Kleikamp memcpy(new_bh->b_data, s->base, new_bh->b_size); 2167dac7a4b4STheodore Ts'o ext4_xattr_block_csum_set(inode, new_bh); 2168ac27a0ecSDave Kleikamp set_buffer_uptodate(new_bh); 2169ac27a0ecSDave Kleikamp unlock_buffer(new_bh); 217047387409STahsin Erdogan ext4_xattr_block_cache_insert(ea_block_cache, new_bh); 2171dac7a4b4STheodore Ts'o error = ext4_handle_dirty_metadata(handle, inode, 2172dac7a4b4STheodore Ts'o new_bh); 2173ac27a0ecSDave Kleikamp if (error) 2174ac27a0ecSDave Kleikamp goto cleanup; 2175ac27a0ecSDave Kleikamp } 2176ac27a0ecSDave Kleikamp } 2177ac27a0ecSDave Kleikamp 2178a6d05676STahsin Erdogan if (old_ea_inode_quota) 2179a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, NULL, old_ea_inode_quota); 2180dec214d0STahsin Erdogan 2181ac27a0ecSDave Kleikamp /* Update the inode. */ 2182617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = new_bh ? new_bh->b_blocknr : 0; 2183ac27a0ecSDave Kleikamp 2184ac27a0ecSDave Kleikamp /* Drop the previous xattr block. */ 2185dec214d0STahsin Erdogan if (bs->bh && bs->bh != new_bh) { 2186dec214d0STahsin Erdogan struct ext4_xattr_inode_array *ea_inode_array = NULL; 2187dec214d0STahsin Erdogan 2188dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bs->bh, 2189dec214d0STahsin Erdogan &ea_inode_array, 2190dec214d0STahsin Erdogan 0 /* extra_credits */); 2191dec214d0STahsin Erdogan ext4_xattr_inode_array_free(ea_inode_array); 2192dec214d0STahsin Erdogan } 2193ac27a0ecSDave Kleikamp error = 0; 2194ac27a0ecSDave Kleikamp 2195ac27a0ecSDave Kleikamp cleanup: 2196dec214d0STahsin Erdogan if (ea_inode) { 2197dec214d0STahsin Erdogan int error2; 2198dec214d0STahsin Erdogan 2199dec214d0STahsin Erdogan error2 = ext4_xattr_inode_dec_ref(handle, ea_inode); 2200dec214d0STahsin Erdogan if (error2) 2201dec214d0STahsin Erdogan ext4_warning_inode(ea_inode, "dec ref error=%d", 2202dec214d0STahsin Erdogan error2); 2203dec214d0STahsin Erdogan 2204dec214d0STahsin Erdogan /* If there was an error, revert the quota charge. */ 2205dec214d0STahsin Erdogan if (error) 2206a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2207dec214d0STahsin Erdogan i_size_read(ea_inode)); 2208dec214d0STahsin Erdogan iput(ea_inode); 2209dec214d0STahsin Erdogan } 2210ac27a0ecSDave Kleikamp if (ce) 221147387409STahsin Erdogan mb_cache_entry_put(ea_block_cache, ce); 2212ac27a0ecSDave Kleikamp brelse(new_bh); 2213ac27a0ecSDave Kleikamp if (!(bs->bh && s->base == bs->bh->b_data)) 2214ac27a0ecSDave Kleikamp kfree(s->base); 2215ac27a0ecSDave Kleikamp 2216ac27a0ecSDave Kleikamp return error; 2217ac27a0ecSDave Kleikamp 2218ac27a0ecSDave Kleikamp cleanup_dquot: 22191231b3a1SLukas Czerner dquot_free_block(inode, EXT4_C2B(EXT4_SB(sb), 1)); 2220ac27a0ecSDave Kleikamp goto cleanup; 2221ac27a0ecSDave Kleikamp 2222ac27a0ecSDave Kleikamp bad_block: 222324676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "bad block %llu", 222424676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2225ac27a0ecSDave Kleikamp goto cleanup; 2226ac27a0ecSDave Kleikamp 2227ac27a0ecSDave Kleikamp #undef header 2228ac27a0ecSDave Kleikamp } 2229ac27a0ecSDave Kleikamp 2230879b3825STao Ma int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i, 2231617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2232ac27a0ecSDave Kleikamp { 2233617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2234617ba13bSMingming Cao struct ext4_inode *raw_inode; 2235ac27a0ecSDave Kleikamp int error; 2236ac27a0ecSDave Kleikamp 223767d7d8adSBaokun Li if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) 2238ac27a0ecSDave Kleikamp return 0; 223967d7d8adSBaokun Li 2240617ba13bSMingming Cao raw_inode = ext4_raw_inode(&is->iloc); 2241ac27a0ecSDave Kleikamp header = IHDR(inode, raw_inode); 2242ac27a0ecSDave Kleikamp is->s.base = is->s.first = IFIRST(header); 2243ac27a0ecSDave Kleikamp is->s.here = is->s.first; 2244617ba13bSMingming Cao is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 224519f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 22469e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, is->s.end); 2247ac27a0ecSDave Kleikamp if (error) 2248ac27a0ecSDave Kleikamp return error; 2249ac27a0ecSDave Kleikamp /* Find the named attribute. */ 22509496005dSTheodore Ts'o error = xattr_find_entry(inode, &is->s.here, is->s.end, 22519496005dSTheodore Ts'o i->name_index, i->name, 0); 2252ac27a0ecSDave Kleikamp if (error && error != -ENODATA) 2253ac27a0ecSDave Kleikamp return error; 2254ac27a0ecSDave Kleikamp is->s.not_found = error; 2255ac27a0ecSDave Kleikamp } 2256ac27a0ecSDave Kleikamp return 0; 2257ac27a0ecSDave Kleikamp } 2258ac27a0ecSDave Kleikamp 2259310c097cSRitesh Harjani int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, 2260617ba13bSMingming Cao struct ext4_xattr_info *i, 2261617ba13bSMingming Cao struct ext4_xattr_ibody_find *is) 2262ac27a0ecSDave Kleikamp { 2263617ba13bSMingming Cao struct ext4_xattr_ibody_header *header; 2264617ba13bSMingming Cao struct ext4_xattr_search *s = &is->s; 2265ac27a0ecSDave Kleikamp int error; 2266ac27a0ecSDave Kleikamp 226767d7d8adSBaokun Li if (!EXT4_INODE_HAS_XATTR_SPACE(inode)) 2268ac27a0ecSDave Kleikamp return -ENOSPC; 226967d7d8adSBaokun Li 2270daf83281STahsin Erdogan error = ext4_xattr_set_entry(i, s, handle, inode, false /* is_block */); 2271ac27a0ecSDave Kleikamp if (error) 2272ac27a0ecSDave Kleikamp return error; 2273617ba13bSMingming Cao header = IHDR(inode, ext4_raw_inode(&is->iloc)); 2274ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(s->first)) { 2275617ba13bSMingming Cao header->h_magic = cpu_to_le32(EXT4_XATTR_MAGIC); 227619f5fb7aSTheodore Ts'o ext4_set_inode_state(inode, EXT4_STATE_XATTR); 2277ac27a0ecSDave Kleikamp } else { 2278ac27a0ecSDave Kleikamp header->h_magic = cpu_to_le32(0); 227919f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_XATTR); 2280ac27a0ecSDave Kleikamp } 2281ac27a0ecSDave Kleikamp return 0; 2282ac27a0ecSDave Kleikamp } 2283ac27a0ecSDave Kleikamp 22843fd16462SJan Kara static int ext4_xattr_value_same(struct ext4_xattr_search *s, 22853fd16462SJan Kara struct ext4_xattr_info *i) 22863fd16462SJan Kara { 22873fd16462SJan Kara void *value; 22883fd16462SJan Kara 22890bd454c0STahsin Erdogan /* When e_value_inum is set the value is stored externally. */ 22900bd454c0STahsin Erdogan if (s->here->e_value_inum) 22910bd454c0STahsin Erdogan return 0; 22923fd16462SJan Kara if (le32_to_cpu(s->here->e_value_size) != i->value_len) 22933fd16462SJan Kara return 0; 22943fd16462SJan Kara value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); 22953fd16462SJan Kara return !memcmp(value, i->value, i->value_len); 22963fd16462SJan Kara } 22973fd16462SJan Kara 2298dec214d0STahsin Erdogan static struct buffer_head *ext4_xattr_get_block(struct inode *inode) 2299dec214d0STahsin Erdogan { 2300dec214d0STahsin Erdogan struct buffer_head *bh; 2301dec214d0STahsin Erdogan int error; 2302dec214d0STahsin Erdogan 2303dec214d0STahsin Erdogan if (!EXT4_I(inode)->i_file_acl) 2304dec214d0STahsin Erdogan return NULL; 2305fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2306fb265c9cSTheodore Ts'o if (IS_ERR(bh)) 2307fb265c9cSTheodore Ts'o return bh; 2308dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2309ecaaf408SVasily Averin if (error) { 2310ecaaf408SVasily Averin brelse(bh); 2311dec214d0STahsin Erdogan return ERR_PTR(error); 2312ecaaf408SVasily Averin } 2313dec214d0STahsin Erdogan return bh; 2314dec214d0STahsin Erdogan } 2315dec214d0STahsin Erdogan 2316ac27a0ecSDave Kleikamp /* 2317617ba13bSMingming Cao * ext4_xattr_set_handle() 2318ac27a0ecSDave Kleikamp * 23196e9510b0SWang Sheng-Hui * Create, replace or remove an extended attribute for this inode. Value 2320ac27a0ecSDave Kleikamp * is NULL to remove an existing extended attribute, and non-NULL to 2321ac27a0ecSDave Kleikamp * either replace an existing extended attribute, or create a new extended 2322ac27a0ecSDave Kleikamp * attribute. The flags XATTR_REPLACE and XATTR_CREATE 2323ac27a0ecSDave Kleikamp * specify that an extended attribute must exist and must not exist 2324ac27a0ecSDave Kleikamp * previous to the call, respectively. 2325ac27a0ecSDave Kleikamp * 2326ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2327ac27a0ecSDave Kleikamp */ 2328ac27a0ecSDave Kleikamp int 2329617ba13bSMingming Cao ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, 2330ac27a0ecSDave Kleikamp const char *name, const void *value, size_t value_len, 2331ac27a0ecSDave Kleikamp int flags) 2332ac27a0ecSDave Kleikamp { 2333617ba13bSMingming Cao struct ext4_xattr_info i = { 2334ac27a0ecSDave Kleikamp .name_index = name_index, 2335ac27a0ecSDave Kleikamp .name = name, 2336ac27a0ecSDave Kleikamp .value = value, 2337ac27a0ecSDave Kleikamp .value_len = value_len, 2338e50e5129SAndreas Dilger .in_inode = 0, 2339ac27a0ecSDave Kleikamp }; 2340617ba13bSMingming Cao struct ext4_xattr_ibody_find is = { 2341ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2342ac27a0ecSDave Kleikamp }; 2343617ba13bSMingming Cao struct ext4_xattr_block_find bs = { 2344ac27a0ecSDave Kleikamp .s = { .not_found = -ENODATA, }, 2345ac27a0ecSDave Kleikamp }; 2346c755e251STheodore Ts'o int no_expand; 2347ac27a0ecSDave Kleikamp int error; 2348ac27a0ecSDave Kleikamp 2349ac27a0ecSDave Kleikamp if (!name) 2350ac27a0ecSDave Kleikamp return -EINVAL; 2351ac27a0ecSDave Kleikamp if (strlen(name) > 255) 2352ac27a0ecSDave Kleikamp return -ERANGE; 2353b8cb5a54STahsin Erdogan 2354c755e251STheodore Ts'o ext4_write_lock_xattr(inode, &no_expand); 23554d20c685SKalpak Shah 2356c1a5d5f6STahsin Erdogan /* Check journal credits under write lock. */ 2357c1a5d5f6STahsin Erdogan if (ext4_handle_valid(handle)) { 2358dec214d0STahsin Erdogan struct buffer_head *bh; 2359c1a5d5f6STahsin Erdogan int credits; 2360c1a5d5f6STahsin Erdogan 2361dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2362dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2363dec214d0STahsin Erdogan error = PTR_ERR(bh); 2364dec214d0STahsin Erdogan goto cleanup; 2365dec214d0STahsin Erdogan } 2366dec214d0STahsin Erdogan 2367af65207cSTahsin Erdogan credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2368af65207cSTahsin Erdogan value_len, 2369af65207cSTahsin Erdogan flags & XATTR_CREATE); 2370dec214d0STahsin Erdogan brelse(bh); 2371dec214d0STahsin Erdogan 2372a9a8344eSJan Kara if (jbd2_handle_buffer_credits(handle) < credits) { 2373c1a5d5f6STahsin Erdogan error = -ENOSPC; 2374c1a5d5f6STahsin Erdogan goto cleanup; 2375c1a5d5f6STahsin Erdogan } 2376163f0ec1SJan Kara WARN_ON_ONCE(!(current->flags & PF_MEMALLOC_NOFS)); 2377c1a5d5f6STahsin Erdogan } 2378c1a5d5f6STahsin Erdogan 237966543617SEric Sandeen error = ext4_reserve_inode_write(handle, inode, &is.iloc); 238086ebfd08SEric Sandeen if (error) 238186ebfd08SEric Sandeen goto cleanup; 238286ebfd08SEric Sandeen 238319f5fb7aSTheodore Ts'o if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) { 2384617ba13bSMingming Cao struct ext4_inode *raw_inode = ext4_raw_inode(&is.iloc); 2385617ba13bSMingming Cao memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size); 238619f5fb7aSTheodore Ts'o ext4_clear_inode_state(inode, EXT4_STATE_NEW); 2387ac27a0ecSDave Kleikamp } 2388ac27a0ecSDave Kleikamp 2389617ba13bSMingming Cao error = ext4_xattr_ibody_find(inode, &i, &is); 2390ac27a0ecSDave Kleikamp if (error) 2391ac27a0ecSDave Kleikamp goto cleanup; 2392ac27a0ecSDave Kleikamp if (is.s.not_found) 2393617ba13bSMingming Cao error = ext4_xattr_block_find(inode, &i, &bs); 2394ac27a0ecSDave Kleikamp if (error) 2395ac27a0ecSDave Kleikamp goto cleanup; 2396ac27a0ecSDave Kleikamp if (is.s.not_found && bs.s.not_found) { 2397ac27a0ecSDave Kleikamp error = -ENODATA; 2398ac27a0ecSDave Kleikamp if (flags & XATTR_REPLACE) 2399ac27a0ecSDave Kleikamp goto cleanup; 2400ac27a0ecSDave Kleikamp error = 0; 2401ac27a0ecSDave Kleikamp if (!value) 2402ac27a0ecSDave Kleikamp goto cleanup; 2403ac27a0ecSDave Kleikamp } else { 2404ac27a0ecSDave Kleikamp error = -EEXIST; 2405ac27a0ecSDave Kleikamp if (flags & XATTR_CREATE) 2406ac27a0ecSDave Kleikamp goto cleanup; 2407ac27a0ecSDave Kleikamp } 2408dec214d0STahsin Erdogan 2409ac27a0ecSDave Kleikamp if (!value) { 2410ac27a0ecSDave Kleikamp if (!is.s.not_found) 2411e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2412ac27a0ecSDave Kleikamp else if (!bs.s.not_found) 2413617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2414ac27a0ecSDave Kleikamp } else { 24153fd16462SJan Kara error = 0; 24163fd16462SJan Kara /* Xattr value did not change? Save us some work and bail out */ 24173fd16462SJan Kara if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) 24183fd16462SJan Kara goto cleanup; 24193fd16462SJan Kara if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) 24203fd16462SJan Kara goto cleanup; 24213fd16462SJan Kara 2422b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2423b347e2bcSTahsin Erdogan (EXT4_XATTR_SIZE(i.value_len) > 2424b347e2bcSTahsin Erdogan EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize))) 2425b347e2bcSTahsin Erdogan i.in_inode = 1; 2426b347e2bcSTahsin Erdogan retry_inode: 2427e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, &is); 2428ac27a0ecSDave Kleikamp if (!error && !bs.s.not_found) { 2429ac27a0ecSDave Kleikamp i.value = NULL; 2430617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2431ac27a0ecSDave Kleikamp } else if (error == -ENOSPC) { 24327e01c8e5STiger Yang if (EXT4_I(inode)->i_file_acl && !bs.s.base) { 243345ae932dSVasily Averin brelse(bs.bh); 243445ae932dSVasily Averin bs.bh = NULL; 24357e01c8e5STiger Yang error = ext4_xattr_block_find(inode, &i, &bs); 24367e01c8e5STiger Yang if (error) 24377e01c8e5STiger Yang goto cleanup; 24387e01c8e5STiger Yang } 2439617ba13bSMingming Cao error = ext4_xattr_block_set(handle, inode, &i, &bs); 2440b347e2bcSTahsin Erdogan if (!error && !is.s.not_found) { 2441ac27a0ecSDave Kleikamp i.value = NULL; 2442e50e5129SAndreas Dilger error = ext4_xattr_ibody_set(handle, inode, &i, 2443e50e5129SAndreas Dilger &is); 2444b347e2bcSTahsin Erdogan } else if (error == -ENOSPC) { 2445b347e2bcSTahsin Erdogan /* 2446b347e2bcSTahsin Erdogan * Xattr does not fit in the block, store at 2447b347e2bcSTahsin Erdogan * external inode if possible. 2448b347e2bcSTahsin Erdogan */ 2449b347e2bcSTahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 24506b224899Szhangyi (F) i.value_len && !i.in_inode) { 2451b347e2bcSTahsin Erdogan i.in_inode = 1; 2452b347e2bcSTahsin Erdogan goto retry_inode; 2453b347e2bcSTahsin Erdogan } 2454ac27a0ecSDave Kleikamp } 2455ac27a0ecSDave Kleikamp } 2456ac27a0ecSDave Kleikamp } 2457ac27a0ecSDave Kleikamp if (!error) { 2458617ba13bSMingming Cao ext4_xattr_update_super_block(handle, inode->i_sb); 2459eeca7ea1SDeepa Dinamani inode->i_ctime = current_time(inode); 2460a642c2c0SJeff Layton inode_inc_iversion(inode); 24616dd4ee7cSKalpak Shah if (!value) 2462c755e251STheodore Ts'o no_expand = 0; 2463617ba13bSMingming Cao error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); 2464ac27a0ecSDave Kleikamp /* 2465617ba13bSMingming Cao * The bh is consumed by ext4_mark_iloc_dirty, even with 2466ac27a0ecSDave Kleikamp * error != 0. 2467ac27a0ecSDave Kleikamp */ 2468ac27a0ecSDave Kleikamp is.iloc.bh = NULL; 2469ac27a0ecSDave Kleikamp if (IS_SYNC(inode)) 24700390131bSFrank Mayhar ext4_handle_sync(handle); 2471ac27a0ecSDave Kleikamp } 2472e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, handle); 2473ac27a0ecSDave Kleikamp 2474ac27a0ecSDave Kleikamp cleanup: 2475ac27a0ecSDave Kleikamp brelse(is.iloc.bh); 2476ac27a0ecSDave Kleikamp brelse(bs.bh); 2477c755e251STheodore Ts'o ext4_write_unlock_xattr(inode, &no_expand); 2478ac27a0ecSDave Kleikamp return error; 2479ac27a0ecSDave Kleikamp } 2480ac27a0ecSDave Kleikamp 2481af65207cSTahsin Erdogan int ext4_xattr_set_credits(struct inode *inode, size_t value_len, 2482af65207cSTahsin Erdogan bool is_create, int *credits) 2483c1a5d5f6STahsin Erdogan { 2484dec214d0STahsin Erdogan struct buffer_head *bh; 2485dec214d0STahsin Erdogan int err; 2486c1a5d5f6STahsin Erdogan 2487dec214d0STahsin Erdogan *credits = 0; 2488dec214d0STahsin Erdogan 2489dec214d0STahsin Erdogan if (!EXT4_SB(inode->i_sb)->s_journal) 2490c1a5d5f6STahsin Erdogan return 0; 2491c1a5d5f6STahsin Erdogan 2492dec214d0STahsin Erdogan down_read(&EXT4_I(inode)->xattr_sem); 2493c1a5d5f6STahsin Erdogan 2494dec214d0STahsin Erdogan bh = ext4_xattr_get_block(inode); 2495dec214d0STahsin Erdogan if (IS_ERR(bh)) { 2496dec214d0STahsin Erdogan err = PTR_ERR(bh); 2497dec214d0STahsin Erdogan } else { 2498af65207cSTahsin Erdogan *credits = __ext4_xattr_set_credits(inode->i_sb, inode, bh, 2499af65207cSTahsin Erdogan value_len, is_create); 2500dec214d0STahsin Erdogan brelse(bh); 2501dec214d0STahsin Erdogan err = 0; 2502c1a5d5f6STahsin Erdogan } 2503dec214d0STahsin Erdogan 2504dec214d0STahsin Erdogan up_read(&EXT4_I(inode)->xattr_sem); 2505dec214d0STahsin Erdogan return err; 2506c1a5d5f6STahsin Erdogan } 2507c1a5d5f6STahsin Erdogan 2508ac27a0ecSDave Kleikamp /* 2509617ba13bSMingming Cao * ext4_xattr_set() 2510ac27a0ecSDave Kleikamp * 2511617ba13bSMingming Cao * Like ext4_xattr_set_handle, but start from an inode. This extended 2512ac27a0ecSDave Kleikamp * attribute modification is a filesystem transaction by itself. 2513ac27a0ecSDave Kleikamp * 2514ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 2515ac27a0ecSDave Kleikamp */ 2516ac27a0ecSDave Kleikamp int 2517617ba13bSMingming Cao ext4_xattr_set(struct inode *inode, int name_index, const char *name, 2518ac27a0ecSDave Kleikamp const void *value, size_t value_len, int flags) 2519ac27a0ecSDave Kleikamp { 2520ac27a0ecSDave Kleikamp handle_t *handle; 2521e50e5129SAndreas Dilger struct super_block *sb = inode->i_sb; 2522ac27a0ecSDave Kleikamp int error, retries = 0; 2523c1a5d5f6STahsin Erdogan int credits; 2524ac27a0ecSDave Kleikamp 2525b8cb5a54STahsin Erdogan error = dquot_initialize(inode); 2526b8cb5a54STahsin Erdogan if (error) 2527b8cb5a54STahsin Erdogan return error; 2528e50e5129SAndreas Dilger 2529ac27a0ecSDave Kleikamp retry: 2530af65207cSTahsin Erdogan error = ext4_xattr_set_credits(inode, value_len, flags & XATTR_CREATE, 2531af65207cSTahsin Erdogan &credits); 2532dec214d0STahsin Erdogan if (error) 2533dec214d0STahsin Erdogan return error; 2534dec214d0STahsin Erdogan 25359924a92aSTheodore Ts'o handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits); 2536ac27a0ecSDave Kleikamp if (IS_ERR(handle)) { 2537ac27a0ecSDave Kleikamp error = PTR_ERR(handle); 2538ac27a0ecSDave Kleikamp } else { 2539ac27a0ecSDave Kleikamp int error2; 2540ac27a0ecSDave Kleikamp 2541617ba13bSMingming Cao error = ext4_xattr_set_handle(handle, inode, name_index, name, 2542ac27a0ecSDave Kleikamp value, value_len, flags); 2543617ba13bSMingming Cao error2 = ext4_journal_stop(handle); 2544ac27a0ecSDave Kleikamp if (error == -ENOSPC && 2545e50e5129SAndreas Dilger ext4_should_retry_alloc(sb, &retries)) 2546ac27a0ecSDave Kleikamp goto retry; 2547ac27a0ecSDave Kleikamp if (error == 0) 2548ac27a0ecSDave Kleikamp error = error2; 2549ac27a0ecSDave Kleikamp } 2550e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, NULL); 2551ac27a0ecSDave Kleikamp 2552ac27a0ecSDave Kleikamp return error; 2553ac27a0ecSDave Kleikamp } 2554ac27a0ecSDave Kleikamp 2555ac27a0ecSDave Kleikamp /* 25566dd4ee7cSKalpak Shah * Shift the EA entries in the inode to create space for the increased 25576dd4ee7cSKalpak Shah * i_extra_isize. 25586dd4ee7cSKalpak Shah */ 25596dd4ee7cSKalpak Shah static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry, 25606dd4ee7cSKalpak Shah int value_offs_shift, void *to, 256194405713SJan Kara void *from, size_t n) 25626dd4ee7cSKalpak Shah { 25636dd4ee7cSKalpak Shah struct ext4_xattr_entry *last = entry; 25646dd4ee7cSKalpak Shah int new_offs; 25656dd4ee7cSKalpak Shah 256694405713SJan Kara /* We always shift xattr headers further thus offsets get lower */ 256794405713SJan Kara BUG_ON(value_offs_shift > 0); 256894405713SJan Kara 25696dd4ee7cSKalpak Shah /* Adjust the value offsets of the entries */ 25706dd4ee7cSKalpak Shah for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 2571e50e5129SAndreas Dilger if (!last->e_value_inum && last->e_value_size) { 25726dd4ee7cSKalpak Shah new_offs = le16_to_cpu(last->e_value_offs) + 25736dd4ee7cSKalpak Shah value_offs_shift; 25746dd4ee7cSKalpak Shah last->e_value_offs = cpu_to_le16(new_offs); 25756dd4ee7cSKalpak Shah } 25766dd4ee7cSKalpak Shah } 25776dd4ee7cSKalpak Shah /* Shift the entries by n bytes */ 25786dd4ee7cSKalpak Shah memmove(to, from, n); 25796dd4ee7cSKalpak Shah } 25806dd4ee7cSKalpak Shah 25816dd4ee7cSKalpak Shah /* 25823f2571c1SJan Kara * Move xattr pointed to by 'entry' from inode into external xattr block 25833f2571c1SJan Kara */ 25843f2571c1SJan Kara static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode, 25853f2571c1SJan Kara struct ext4_inode *raw_inode, 25863f2571c1SJan Kara struct ext4_xattr_entry *entry) 25873f2571c1SJan Kara { 25883f2571c1SJan Kara struct ext4_xattr_ibody_find *is = NULL; 25893f2571c1SJan Kara struct ext4_xattr_block_find *bs = NULL; 25903f2571c1SJan Kara char *buffer = NULL, *b_entry_name = NULL; 2591f6109100STahsin Erdogan size_t value_size = le32_to_cpu(entry->e_value_size); 25923f2571c1SJan Kara struct ext4_xattr_info i = { 25933f2571c1SJan Kara .value = NULL, 25943f2571c1SJan Kara .value_len = 0, 25953f2571c1SJan Kara .name_index = entry->e_name_index, 2596f6109100STahsin Erdogan .in_inode = !!entry->e_value_inum, 25973f2571c1SJan Kara }; 25983f2571c1SJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 25993f2571c1SJan Kara int error; 26003f2571c1SJan Kara 26013f2571c1SJan Kara is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS); 26023f2571c1SJan Kara bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS); 26033f2571c1SJan Kara b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS); 2604*1e9d62d2SJun Nie if (!is || !bs || !b_entry_name) { 26053f2571c1SJan Kara error = -ENOMEM; 26063f2571c1SJan Kara goto out; 26073f2571c1SJan Kara } 26083f2571c1SJan Kara 26093f2571c1SJan Kara is->s.not_found = -ENODATA; 26103f2571c1SJan Kara bs->s.not_found = -ENODATA; 26113f2571c1SJan Kara is->iloc.bh = NULL; 26123f2571c1SJan Kara bs->bh = NULL; 26133f2571c1SJan Kara 26143f2571c1SJan Kara /* Save the entry name and the entry value */ 2615f6109100STahsin Erdogan if (entry->e_value_inum) { 2616*1e9d62d2SJun Nie buffer = kvmalloc(value_size, GFP_NOFS); 2617*1e9d62d2SJun Nie if (!buffer) { 2618*1e9d62d2SJun Nie error = -ENOMEM; 2619*1e9d62d2SJun Nie goto out; 2620*1e9d62d2SJun Nie } 2621*1e9d62d2SJun Nie 2622b9fc761eSTahsin Erdogan error = ext4_xattr_inode_get(inode, entry, buffer, value_size); 2623f6109100STahsin Erdogan if (error) 2624f6109100STahsin Erdogan goto out; 2625f6109100STahsin Erdogan } else { 2626f6109100STahsin Erdogan size_t value_offs = le16_to_cpu(entry->e_value_offs); 2627*1e9d62d2SJun Nie buffer = (void *)IFIRST(header) + value_offs; 2628f6109100STahsin Erdogan } 2629f6109100STahsin Erdogan 26303f2571c1SJan Kara memcpy(b_entry_name, entry->e_name, entry->e_name_len); 26313f2571c1SJan Kara b_entry_name[entry->e_name_len] = '\0'; 26323f2571c1SJan Kara i.name = b_entry_name; 26333f2571c1SJan Kara 26343f2571c1SJan Kara error = ext4_get_inode_loc(inode, &is->iloc); 26353f2571c1SJan Kara if (error) 26363f2571c1SJan Kara goto out; 26373f2571c1SJan Kara 26383f2571c1SJan Kara error = ext4_xattr_ibody_find(inode, &i, is); 26393f2571c1SJan Kara if (error) 26403f2571c1SJan Kara goto out; 26413f2571c1SJan Kara 26423f2571c1SJan Kara i.value = buffer; 26433f2571c1SJan Kara i.value_len = value_size; 26443f2571c1SJan Kara error = ext4_xattr_block_find(inode, &i, bs); 26453f2571c1SJan Kara if (error) 26463f2571c1SJan Kara goto out; 26473f2571c1SJan Kara 2648*1e9d62d2SJun Nie /* Move ea entry from the inode into the block */ 26493f2571c1SJan Kara error = ext4_xattr_block_set(handle, inode, &i, bs); 26503f2571c1SJan Kara if (error) 26513f2571c1SJan Kara goto out; 2652*1e9d62d2SJun Nie 2653*1e9d62d2SJun Nie /* Remove the chosen entry from the inode */ 2654*1e9d62d2SJun Nie i.value = NULL; 2655*1e9d62d2SJun Nie i.value_len = 0; 2656*1e9d62d2SJun Nie error = ext4_xattr_ibody_set(handle, inode, &i, is); 2657*1e9d62d2SJun Nie 26583f2571c1SJan Kara out: 26593f2571c1SJan Kara kfree(b_entry_name); 2660*1e9d62d2SJun Nie if (entry->e_value_inum && buffer) 2661cc12a6f2SYe Bin kvfree(buffer); 26623f2571c1SJan Kara if (is) 26633f2571c1SJan Kara brelse(is->iloc.bh); 26646bdc9977SVasily Averin if (bs) 26656bdc9977SVasily Averin brelse(bs->bh); 26663f2571c1SJan Kara kfree(is); 26673f2571c1SJan Kara kfree(bs); 26683f2571c1SJan Kara 26693f2571c1SJan Kara return error; 26703f2571c1SJan Kara } 26713f2571c1SJan Kara 2672dfa2064bSJan Kara static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode, 2673dfa2064bSJan Kara struct ext4_inode *raw_inode, 2674dfa2064bSJan Kara int isize_diff, size_t ifree, 2675dfa2064bSJan Kara size_t bfree, int *total_ino) 2676dfa2064bSJan Kara { 2677dfa2064bSJan Kara struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode); 2678dfa2064bSJan Kara struct ext4_xattr_entry *small_entry; 2679dfa2064bSJan Kara struct ext4_xattr_entry *entry; 2680dfa2064bSJan Kara struct ext4_xattr_entry *last; 2681dfa2064bSJan Kara unsigned int entry_size; /* EA entry size */ 2682dfa2064bSJan Kara unsigned int total_size; /* EA entry size + value size */ 2683dfa2064bSJan Kara unsigned int min_total_size; 2684dfa2064bSJan Kara int error; 2685dfa2064bSJan Kara 2686dfa2064bSJan Kara while (isize_diff > ifree) { 2687dfa2064bSJan Kara entry = NULL; 2688dfa2064bSJan Kara small_entry = NULL; 2689dfa2064bSJan Kara min_total_size = ~0U; 2690dfa2064bSJan Kara last = IFIRST(header); 2691dfa2064bSJan Kara /* Find the entry best suited to be pushed into EA block */ 2692dfa2064bSJan Kara for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) { 26938cdb5240STheodore Ts'o /* never move system.data out of the inode */ 26948cdb5240STheodore Ts'o if ((last->e_name_len == 4) && 26958cdb5240STheodore Ts'o (last->e_name_index == EXT4_XATTR_INDEX_SYSTEM) && 26968cdb5240STheodore Ts'o !memcmp(last->e_name, "data", 4)) 26978cdb5240STheodore Ts'o continue; 26989bb21cedSTahsin Erdogan total_size = EXT4_XATTR_LEN(last->e_name_len); 26999bb21cedSTahsin Erdogan if (!last->e_value_inum) 27009bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 27019bb21cedSTahsin Erdogan le32_to_cpu(last->e_value_size)); 2702dfa2064bSJan Kara if (total_size <= bfree && 2703dfa2064bSJan Kara total_size < min_total_size) { 2704dfa2064bSJan Kara if (total_size + ifree < isize_diff) { 2705dfa2064bSJan Kara small_entry = last; 2706dfa2064bSJan Kara } else { 2707dfa2064bSJan Kara entry = last; 2708dfa2064bSJan Kara min_total_size = total_size; 2709dfa2064bSJan Kara } 2710dfa2064bSJan Kara } 2711dfa2064bSJan Kara } 2712dfa2064bSJan Kara 2713dfa2064bSJan Kara if (entry == NULL) { 2714dfa2064bSJan Kara if (small_entry == NULL) 2715dfa2064bSJan Kara return -ENOSPC; 2716dfa2064bSJan Kara entry = small_entry; 2717dfa2064bSJan Kara } 2718dfa2064bSJan Kara 2719dfa2064bSJan Kara entry_size = EXT4_XATTR_LEN(entry->e_name_len); 27209bb21cedSTahsin Erdogan total_size = entry_size; 27219bb21cedSTahsin Erdogan if (!entry->e_value_inum) 27229bb21cedSTahsin Erdogan total_size += EXT4_XATTR_SIZE( 27239bb21cedSTahsin Erdogan le32_to_cpu(entry->e_value_size)); 2724dfa2064bSJan Kara error = ext4_xattr_move_to_block(handle, inode, raw_inode, 2725dfa2064bSJan Kara entry); 2726dfa2064bSJan Kara if (error) 2727dfa2064bSJan Kara return error; 2728dfa2064bSJan Kara 2729dfa2064bSJan Kara *total_ino -= entry_size; 2730dfa2064bSJan Kara ifree += total_size; 2731dfa2064bSJan Kara bfree -= total_size; 2732dfa2064bSJan Kara } 2733dfa2064bSJan Kara 2734dfa2064bSJan Kara return 0; 2735dfa2064bSJan Kara } 2736dfa2064bSJan Kara 27373f2571c1SJan Kara /* 27386dd4ee7cSKalpak Shah * Expand an inode by new_extra_isize bytes when EAs are present. 27396dd4ee7cSKalpak Shah * Returns 0 on success or negative error number on failure. 27406dd4ee7cSKalpak Shah */ 27416dd4ee7cSKalpak Shah int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 27426dd4ee7cSKalpak Shah struct ext4_inode *raw_inode, handle_t *handle) 27436dd4ee7cSKalpak Shah { 27446dd4ee7cSKalpak Shah struct ext4_xattr_ibody_header *header; 2745cf0a5e81SMiao Xie struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 2746cf0a5e81SMiao Xie static unsigned int mnt_count; 2747e3014d14SJan Kara size_t min_offs; 2748e3014d14SJan Kara size_t ifree, bfree; 27497b1b2c1bSTheodore Ts'o int total_ino; 27506e0cd088SJan Kara void *base, *end; 2751d0141191SJan Kara int error = 0, tried_min_extra_isize = 0; 2752cf0a5e81SMiao Xie int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize); 2753d0141191SJan Kara int isize_diff; /* How much do we need to grow i_extra_isize */ 2754c755e251STheodore Ts'o 27556dd4ee7cSKalpak Shah retry: 2756d0141191SJan Kara isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; 27572e81a4eeSJan Kara if (EXT4_I(inode)->i_extra_isize >= new_extra_isize) 2758b640b2c5SMiao Xie return 0; 27596dd4ee7cSKalpak Shah 27606dd4ee7cSKalpak Shah header = IHDR(inode, raw_inode); 27616dd4ee7cSKalpak Shah 27626dd4ee7cSKalpak Shah /* 27636dd4ee7cSKalpak Shah * Check if enough free space is available in the inode to shift the 27646dd4ee7cSKalpak Shah * entries ahead by new_extra_isize. 27656dd4ee7cSKalpak Shah */ 27666dd4ee7cSKalpak Shah 27676e0cd088SJan Kara base = IFIRST(header); 27686dd4ee7cSKalpak Shah end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size; 27696dd4ee7cSKalpak Shah min_offs = end - base; 2770a805622aSTheodore Ts'o total_ino = sizeof(struct ext4_xattr_ibody_header) + sizeof(u32); 27716dd4ee7cSKalpak Shah 27729e92f48cSTheodore Ts'o error = xattr_check_inode(inode, header, end); 27739e92f48cSTheodore Ts'o if (error) 27749e92f48cSTheodore Ts'o goto cleanup; 27759e92f48cSTheodore Ts'o 27766e0cd088SJan Kara ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino); 2777e3014d14SJan Kara if (ifree >= isize_diff) 2778e3014d14SJan Kara goto shift; 27796dd4ee7cSKalpak Shah 27806dd4ee7cSKalpak Shah /* 27816dd4ee7cSKalpak Shah * Enough free space isn't available in the inode, check if 27826dd4ee7cSKalpak Shah * EA block can hold new_extra_isize bytes. 27836dd4ee7cSKalpak Shah */ 27846dd4ee7cSKalpak Shah if (EXT4_I(inode)->i_file_acl) { 278553692ec0SVasily Averin struct buffer_head *bh; 278653692ec0SVasily Averin 2787fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2788fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 2789fb265c9cSTheodore Ts'o error = PTR_ERR(bh); 27906dd4ee7cSKalpak Shah goto cleanup; 2791fb265c9cSTheodore Ts'o } 2792de05ca85STheodore Ts'o error = ext4_xattr_check_block(inode, bh); 279353692ec0SVasily Averin if (error) { 279453692ec0SVasily Averin brelse(bh); 27956dd4ee7cSKalpak Shah goto cleanup; 279653692ec0SVasily Averin } 27976dd4ee7cSKalpak Shah base = BHDR(bh); 27986dd4ee7cSKalpak Shah end = bh->b_data + bh->b_size; 27996dd4ee7cSKalpak Shah min_offs = end - base; 28006e0cd088SJan Kara bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base, 28016e0cd088SJan Kara NULL); 2802b640b2c5SMiao Xie brelse(bh); 2803e3014d14SJan Kara if (bfree + ifree < isize_diff) { 28046dd4ee7cSKalpak Shah if (!tried_min_extra_isize && s_min_extra_isize) { 28056dd4ee7cSKalpak Shah tried_min_extra_isize++; 28066dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 28076dd4ee7cSKalpak Shah goto retry; 28086dd4ee7cSKalpak Shah } 2809dfa2064bSJan Kara error = -ENOSPC; 28106dd4ee7cSKalpak Shah goto cleanup; 28116dd4ee7cSKalpak Shah } 28126dd4ee7cSKalpak Shah } else { 2813e3014d14SJan Kara bfree = inode->i_sb->s_blocksize; 28146dd4ee7cSKalpak Shah } 28156dd4ee7cSKalpak Shah 2816dfa2064bSJan Kara error = ext4_xattr_make_inode_space(handle, inode, raw_inode, 2817dfa2064bSJan Kara isize_diff, ifree, bfree, 2818dfa2064bSJan Kara &total_ino); 2819dfa2064bSJan Kara if (error) { 2820dfa2064bSJan Kara if (error == -ENOSPC && !tried_min_extra_isize && 28216dd4ee7cSKalpak Shah s_min_extra_isize) { 28226dd4ee7cSKalpak Shah tried_min_extra_isize++; 28236dd4ee7cSKalpak Shah new_extra_isize = s_min_extra_isize; 28246dd4ee7cSKalpak Shah goto retry; 28256dd4ee7cSKalpak Shah } 28266dd4ee7cSKalpak Shah goto cleanup; 28276dd4ee7cSKalpak Shah } 2828e3014d14SJan Kara shift: 2829e3014d14SJan Kara /* Adjust the offsets and shift the remaining entries ahead */ 28306e0cd088SJan Kara ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize 2831e3014d14SJan Kara - new_extra_isize, (void *)raw_inode + 2832e3014d14SJan Kara EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize, 283394405713SJan Kara (void *)header, total_ino); 2834e3014d14SJan Kara EXT4_I(inode)->i_extra_isize = new_extra_isize; 28356dd4ee7cSKalpak Shah 28366dd4ee7cSKalpak Shah cleanup: 2837b640b2c5SMiao Xie if (error && (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count))) { 2838cf0a5e81SMiao Xie ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.", 2839cf0a5e81SMiao Xie inode->i_ino); 2840cf0a5e81SMiao Xie mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count); 2841cf0a5e81SMiao Xie } 28426dd4ee7cSKalpak Shah return error; 28436dd4ee7cSKalpak Shah } 28446dd4ee7cSKalpak Shah 2845e50e5129SAndreas Dilger #define EIA_INCR 16 /* must be 2^n */ 2846e50e5129SAndreas Dilger #define EIA_MASK (EIA_INCR - 1) 2847dec214d0STahsin Erdogan 2848dec214d0STahsin Erdogan /* Add the large xattr @inode into @ea_inode_array for deferred iput(). 28490421a189STahsin Erdogan * If @ea_inode_array is new or full it will be grown and the old 2850e50e5129SAndreas Dilger * contents copied over. 2851e50e5129SAndreas Dilger */ 2852e50e5129SAndreas Dilger static int 28530421a189STahsin Erdogan ext4_expand_inode_array(struct ext4_xattr_inode_array **ea_inode_array, 28540421a189STahsin Erdogan struct inode *inode) 2855e50e5129SAndreas Dilger { 28560421a189STahsin Erdogan if (*ea_inode_array == NULL) { 2857e50e5129SAndreas Dilger /* 2858e50e5129SAndreas Dilger * Start with 15 inodes, so it fits into a power-of-two size. 28590421a189STahsin Erdogan * If *ea_inode_array is NULL, this is essentially offsetof() 2860e50e5129SAndreas Dilger */ 28610421a189STahsin Erdogan (*ea_inode_array) = 28620421a189STahsin Erdogan kmalloc(offsetof(struct ext4_xattr_inode_array, 28630421a189STahsin Erdogan inodes[EIA_MASK]), 2864e50e5129SAndreas Dilger GFP_NOFS); 28650421a189STahsin Erdogan if (*ea_inode_array == NULL) 2866e50e5129SAndreas Dilger return -ENOMEM; 28670421a189STahsin Erdogan (*ea_inode_array)->count = 0; 28680421a189STahsin Erdogan } else if (((*ea_inode_array)->count & EIA_MASK) == EIA_MASK) { 2869e50e5129SAndreas Dilger /* expand the array once all 15 + n * 16 slots are full */ 28700421a189STahsin Erdogan struct ext4_xattr_inode_array *new_array = NULL; 28710421a189STahsin Erdogan int count = (*ea_inode_array)->count; 2872e50e5129SAndreas Dilger 2873e50e5129SAndreas Dilger /* if new_array is NULL, this is essentially offsetof() */ 2874e50e5129SAndreas Dilger new_array = kmalloc( 28750421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, 28760421a189STahsin Erdogan inodes[count + EIA_INCR]), 2877e50e5129SAndreas Dilger GFP_NOFS); 2878e50e5129SAndreas Dilger if (new_array == NULL) 2879e50e5129SAndreas Dilger return -ENOMEM; 28800421a189STahsin Erdogan memcpy(new_array, *ea_inode_array, 28810421a189STahsin Erdogan offsetof(struct ext4_xattr_inode_array, inodes[count])); 28820421a189STahsin Erdogan kfree(*ea_inode_array); 28830421a189STahsin Erdogan *ea_inode_array = new_array; 2884e50e5129SAndreas Dilger } 28850421a189STahsin Erdogan (*ea_inode_array)->inodes[(*ea_inode_array)->count++] = inode; 2886e50e5129SAndreas Dilger return 0; 2887e50e5129SAndreas Dilger } 2888e50e5129SAndreas Dilger 28896dd4ee7cSKalpak Shah /* 2890617ba13bSMingming Cao * ext4_xattr_delete_inode() 2891ac27a0ecSDave Kleikamp * 2892e50e5129SAndreas Dilger * Free extended attribute resources associated with this inode. Traverse 2893dec214d0STahsin Erdogan * all entries and decrement reference on any xattr inodes associated with this 2894dec214d0STahsin Erdogan * inode. This is called immediately before an inode is freed. We have exclusive 2895dec214d0STahsin Erdogan * access to the inode. If an orphan inode is deleted it will also release its 2896dec214d0STahsin Erdogan * references on xattr block and xattr inodes. 2897ac27a0ecSDave Kleikamp */ 2898dec214d0STahsin Erdogan int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode, 289930a7eb97STahsin Erdogan struct ext4_xattr_inode_array **ea_inode_array, 290030a7eb97STahsin Erdogan int extra_credits) 2901ac27a0ecSDave Kleikamp { 2902ac27a0ecSDave Kleikamp struct buffer_head *bh = NULL; 2903e50e5129SAndreas Dilger struct ext4_xattr_ibody_header *header; 290430a7eb97STahsin Erdogan struct ext4_iloc iloc = { .bh = NULL }; 2905dec214d0STahsin Erdogan struct ext4_xattr_entry *entry; 2906a6d05676STahsin Erdogan struct inode *ea_inode; 290730a7eb97STahsin Erdogan int error; 290830a7eb97STahsin Erdogan 290983448bdfSJan Kara error = ext4_journal_ensure_credits(handle, extra_credits, 291083448bdfSJan Kara ext4_free_metadata_revoke_credits(inode->i_sb, 1)); 2911a4130367SJan Kara if (error < 0) { 291230a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "ensure credits (error %d)", error); 291330a7eb97STahsin Erdogan goto cleanup; 291430a7eb97STahsin Erdogan } 2915ac27a0ecSDave Kleikamp 2916dec214d0STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb) && 2917dec214d0STahsin Erdogan ext4_test_inode_state(inode, EXT4_STATE_XATTR)) { 2918e50e5129SAndreas Dilger 2919e50e5129SAndreas Dilger error = ext4_get_inode_loc(inode, &iloc); 2920dec214d0STahsin Erdogan if (error) { 2921dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "inode loc (error %d)", error); 2922e50e5129SAndreas Dilger goto cleanup; 2923e50e5129SAndreas Dilger } 2924dec214d0STahsin Erdogan 2925188c299eSJan Kara error = ext4_journal_get_write_access(handle, inode->i_sb, 2926188c299eSJan Kara iloc.bh, EXT4_JTR_NONE); 2927dec214d0STahsin Erdogan if (error) { 2928dec214d0STahsin Erdogan EXT4_ERROR_INODE(inode, "write access (error %d)", 2929dec214d0STahsin Erdogan error); 2930dec214d0STahsin Erdogan goto cleanup; 2931dec214d0STahsin Erdogan } 2932dec214d0STahsin Erdogan 2933dec214d0STahsin Erdogan header = IHDR(inode, ext4_raw_inode(&iloc)); 2934dec214d0STahsin Erdogan if (header->h_magic == cpu_to_le32(EXT4_XATTR_MAGIC)) 2935dec214d0STahsin Erdogan ext4_xattr_inode_dec_ref_all(handle, inode, iloc.bh, 2936dec214d0STahsin Erdogan IFIRST(header), 2937dec214d0STahsin Erdogan false /* block_csum */, 2938dec214d0STahsin Erdogan ea_inode_array, 2939dec214d0STahsin Erdogan extra_credits, 2940dec214d0STahsin Erdogan false /* skip_quota */); 2941dec214d0STahsin Erdogan } 2942dec214d0STahsin Erdogan 2943dec214d0STahsin Erdogan if (EXT4_I(inode)->i_file_acl) { 2944fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO); 2945fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 2946fb265c9cSTheodore Ts'o error = PTR_ERR(bh); 2947878520acSTheodore Ts'o if (error == -EIO) { 294854d3adbcSTheodore Ts'o EXT4_ERROR_INODE_ERR(inode, EIO, 294954d3adbcSTheodore Ts'o "block %llu read error", 295024676da4STheodore Ts'o EXT4_I(inode)->i_file_acl); 2951878520acSTheodore Ts'o } 29527159a986SDan Carpenter bh = NULL; 2953ac27a0ecSDave Kleikamp goto cleanup; 2954ac27a0ecSDave Kleikamp } 2955dec214d0STahsin Erdogan error = ext4_xattr_check_block(inode, bh); 2956de05ca85STheodore Ts'o if (error) 2957ac27a0ecSDave Kleikamp goto cleanup; 2958e50e5129SAndreas Dilger 295930a7eb97STahsin Erdogan if (ext4_has_feature_ea_inode(inode->i_sb)) { 2960dec214d0STahsin Erdogan for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry); 2961a6d05676STahsin Erdogan entry = EXT4_XATTR_NEXT(entry)) { 2962a6d05676STahsin Erdogan if (!entry->e_value_inum) 2963a6d05676STahsin Erdogan continue; 2964a6d05676STahsin Erdogan error = ext4_xattr_inode_iget(inode, 2965a6d05676STahsin Erdogan le32_to_cpu(entry->e_value_inum), 2966a6d05676STahsin Erdogan le32_to_cpu(entry->e_hash), 2967a6d05676STahsin Erdogan &ea_inode); 2968a6d05676STahsin Erdogan if (error) 2969a6d05676STahsin Erdogan continue; 2970a6d05676STahsin Erdogan ext4_xattr_inode_free_quota(inode, ea_inode, 2971dec214d0STahsin Erdogan le32_to_cpu(entry->e_value_size)); 2972a6d05676STahsin Erdogan iput(ea_inode); 2973a6d05676STahsin Erdogan } 2974dec214d0STahsin Erdogan 2975e50e5129SAndreas Dilger } 2976e50e5129SAndreas Dilger 2977dec214d0STahsin Erdogan ext4_xattr_release_block(handle, inode, bh, ea_inode_array, 2978dec214d0STahsin Erdogan extra_credits); 2979dec214d0STahsin Erdogan /* 2980dec214d0STahsin Erdogan * Update i_file_acl value in the same transaction that releases 2981dec214d0STahsin Erdogan * block. 2982dec214d0STahsin Erdogan */ 2983617ba13bSMingming Cao EXT4_I(inode)->i_file_acl = 0; 298430a7eb97STahsin Erdogan error = ext4_mark_inode_dirty(handle, inode); 298530a7eb97STahsin Erdogan if (error) { 298630a7eb97STahsin Erdogan EXT4_ERROR_INODE(inode, "mark inode dirty (error %d)", 298730a7eb97STahsin Erdogan error); 298830a7eb97STahsin Erdogan goto cleanup; 298930a7eb97STahsin Erdogan } 2990e85c81baSXin Yin ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_XATTR, handle); 2991dec214d0STahsin Erdogan } 2992dec214d0STahsin Erdogan error = 0; 2993ac27a0ecSDave Kleikamp cleanup: 299430a7eb97STahsin Erdogan brelse(iloc.bh); 2995ac27a0ecSDave Kleikamp brelse(bh); 2996e50e5129SAndreas Dilger return error; 2997e50e5129SAndreas Dilger } 2998e50e5129SAndreas Dilger 29990421a189STahsin Erdogan void ext4_xattr_inode_array_free(struct ext4_xattr_inode_array *ea_inode_array) 3000e50e5129SAndreas Dilger { 3001dec214d0STahsin Erdogan int idx; 3002e50e5129SAndreas Dilger 30030421a189STahsin Erdogan if (ea_inode_array == NULL) 3004e50e5129SAndreas Dilger return; 3005e50e5129SAndreas Dilger 3006dec214d0STahsin Erdogan for (idx = 0; idx < ea_inode_array->count; ++idx) 3007dec214d0STahsin Erdogan iput(ea_inode_array->inodes[idx]); 30080421a189STahsin Erdogan kfree(ea_inode_array); 3009ac27a0ecSDave Kleikamp } 3010ac27a0ecSDave Kleikamp 3011ac27a0ecSDave Kleikamp /* 301247387409STahsin Erdogan * ext4_xattr_block_cache_insert() 3013ac27a0ecSDave Kleikamp * 301447387409STahsin Erdogan * Create a new entry in the extended attribute block cache, and insert 3015ac27a0ecSDave Kleikamp * it unless such an entry is already in the cache. 3016ac27a0ecSDave Kleikamp * 3017ac27a0ecSDave Kleikamp * Returns 0, or a negative error number on failure. 3018ac27a0ecSDave Kleikamp */ 3019ac27a0ecSDave Kleikamp static void 302047387409STahsin Erdogan ext4_xattr_block_cache_insert(struct mb_cache *ea_block_cache, 302147387409STahsin Erdogan struct buffer_head *bh) 3022ac27a0ecSDave Kleikamp { 30236048c64bSAndreas Gruenbacher struct ext4_xattr_header *header = BHDR(bh); 30246048c64bSAndreas Gruenbacher __u32 hash = le32_to_cpu(header->h_hash); 30256048c64bSAndreas Gruenbacher int reusable = le32_to_cpu(header->h_refcount) < 30266048c64bSAndreas Gruenbacher EXT4_XATTR_REFCOUNT_MAX; 3027ac27a0ecSDave Kleikamp int error; 3028ac27a0ecSDave Kleikamp 3029cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 3030cdb7ee4cSTahsin Erdogan return; 303147387409STahsin Erdogan error = mb_cache_entry_create(ea_block_cache, GFP_NOFS, hash, 30326048c64bSAndreas Gruenbacher bh->b_blocknr, reusable); 3033ac27a0ecSDave Kleikamp if (error) { 303482939d79SJan Kara if (error == -EBUSY) 3035ac27a0ecSDave Kleikamp ea_bdebug(bh, "already in cache"); 303682939d79SJan Kara } else 3037ac27a0ecSDave Kleikamp ea_bdebug(bh, "inserting [%x]", (int)hash); 3038ac27a0ecSDave Kleikamp } 3039ac27a0ecSDave Kleikamp 3040ac27a0ecSDave Kleikamp /* 3041617ba13bSMingming Cao * ext4_xattr_cmp() 3042ac27a0ecSDave Kleikamp * 3043ac27a0ecSDave Kleikamp * Compare two extended attribute blocks for equality. 3044ac27a0ecSDave Kleikamp * 3045ac27a0ecSDave Kleikamp * Returns 0 if the blocks are equal, 1 if they differ, and 3046ac27a0ecSDave Kleikamp * a negative error number on errors. 3047ac27a0ecSDave Kleikamp */ 3048ac27a0ecSDave Kleikamp static int 3049617ba13bSMingming Cao ext4_xattr_cmp(struct ext4_xattr_header *header1, 3050617ba13bSMingming Cao struct ext4_xattr_header *header2) 3051ac27a0ecSDave Kleikamp { 3052617ba13bSMingming Cao struct ext4_xattr_entry *entry1, *entry2; 3053ac27a0ecSDave Kleikamp 3054ac27a0ecSDave Kleikamp entry1 = ENTRY(header1+1); 3055ac27a0ecSDave Kleikamp entry2 = ENTRY(header2+1); 3056ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(entry1)) { 3057ac27a0ecSDave Kleikamp if (IS_LAST_ENTRY(entry2)) 3058ac27a0ecSDave Kleikamp return 1; 3059ac27a0ecSDave Kleikamp if (entry1->e_hash != entry2->e_hash || 3060ac27a0ecSDave Kleikamp entry1->e_name_index != entry2->e_name_index || 3061ac27a0ecSDave Kleikamp entry1->e_name_len != entry2->e_name_len || 3062ac27a0ecSDave Kleikamp entry1->e_value_size != entry2->e_value_size || 3063e50e5129SAndreas Dilger entry1->e_value_inum != entry2->e_value_inum || 3064ac27a0ecSDave Kleikamp memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len)) 3065ac27a0ecSDave Kleikamp return 1; 30667cec1918STahsin Erdogan if (!entry1->e_value_inum && 30677cec1918STahsin Erdogan memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs), 3068ac27a0ecSDave Kleikamp (char *)header2 + le16_to_cpu(entry2->e_value_offs), 3069ac27a0ecSDave Kleikamp le32_to_cpu(entry1->e_value_size))) 3070ac27a0ecSDave Kleikamp return 1; 3071ac27a0ecSDave Kleikamp 3072617ba13bSMingming Cao entry1 = EXT4_XATTR_NEXT(entry1); 3073617ba13bSMingming Cao entry2 = EXT4_XATTR_NEXT(entry2); 3074ac27a0ecSDave Kleikamp } 3075ac27a0ecSDave Kleikamp if (!IS_LAST_ENTRY(entry2)) 3076ac27a0ecSDave Kleikamp return 1; 3077ac27a0ecSDave Kleikamp return 0; 3078ac27a0ecSDave Kleikamp } 3079ac27a0ecSDave Kleikamp 3080ac27a0ecSDave Kleikamp /* 308147387409STahsin Erdogan * ext4_xattr_block_cache_find() 3082ac27a0ecSDave Kleikamp * 3083ac27a0ecSDave Kleikamp * Find an identical extended attribute block. 3084ac27a0ecSDave Kleikamp * 3085ac27a0ecSDave Kleikamp * Returns a pointer to the block found, or NULL if such a block was 3086ac27a0ecSDave Kleikamp * not found or an error occurred. 3087ac27a0ecSDave Kleikamp */ 3088ac27a0ecSDave Kleikamp static struct buffer_head * 308947387409STahsin Erdogan ext4_xattr_block_cache_find(struct inode *inode, 309047387409STahsin Erdogan struct ext4_xattr_header *header, 30917a2508e1SJan Kara struct mb_cache_entry **pce) 3092ac27a0ecSDave Kleikamp { 3093ac27a0ecSDave Kleikamp __u32 hash = le32_to_cpu(header->h_hash); 30947a2508e1SJan Kara struct mb_cache_entry *ce; 309547387409STahsin Erdogan struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode); 3096ac27a0ecSDave Kleikamp 3097cdb7ee4cSTahsin Erdogan if (!ea_block_cache) 3098cdb7ee4cSTahsin Erdogan return NULL; 3099ac27a0ecSDave Kleikamp if (!header->h_hash) 3100ac27a0ecSDave Kleikamp return NULL; /* never share */ 3101ac27a0ecSDave Kleikamp ea_idebug(inode, "looking for cached blocks [%x]", (int)hash); 310247387409STahsin Erdogan ce = mb_cache_entry_find_first(ea_block_cache, hash); 3103ac27a0ecSDave Kleikamp while (ce) { 3104ac27a0ecSDave Kleikamp struct buffer_head *bh; 3105ac27a0ecSDave Kleikamp 3106fb265c9cSTheodore Ts'o bh = ext4_sb_bread(inode->i_sb, ce->e_value, REQ_PRIO); 3107fb265c9cSTheodore Ts'o if (IS_ERR(bh)) { 3108fb265c9cSTheodore Ts'o if (PTR_ERR(bh) == -ENOMEM) 3109fb265c9cSTheodore Ts'o return NULL; 31107159a986SDan Carpenter bh = NULL; 311124676da4STheodore Ts'o EXT4_ERROR_INODE(inode, "block %lu read error", 3112c07dfcb4STahsin Erdogan (unsigned long)ce->e_value); 3113617ba13bSMingming Cao } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) { 3114ac27a0ecSDave Kleikamp *pce = ce; 3115ac27a0ecSDave Kleikamp return bh; 3116ac27a0ecSDave Kleikamp } 3117ac27a0ecSDave Kleikamp brelse(bh); 311847387409STahsin Erdogan ce = mb_cache_entry_find_next(ea_block_cache, ce); 3119ac27a0ecSDave Kleikamp } 3120ac27a0ecSDave Kleikamp return NULL; 3121ac27a0ecSDave Kleikamp } 3122ac27a0ecSDave Kleikamp 3123ac27a0ecSDave Kleikamp #define NAME_HASH_SHIFT 5 3124ac27a0ecSDave Kleikamp #define VALUE_HASH_SHIFT 16 3125ac27a0ecSDave Kleikamp 3126ac27a0ecSDave Kleikamp /* 3127617ba13bSMingming Cao * ext4_xattr_hash_entry() 3128ac27a0ecSDave Kleikamp * 3129ac27a0ecSDave Kleikamp * Compute the hash of an extended attribute. 3130ac27a0ecSDave Kleikamp */ 3131b9fc761eSTahsin Erdogan static __le32 ext4_xattr_hash_entry(char *name, size_t name_len, __le32 *value, 3132b9fc761eSTahsin Erdogan size_t value_count) 3133ac27a0ecSDave Kleikamp { 3134ac27a0ecSDave Kleikamp __u32 hash = 0; 3135ac27a0ecSDave Kleikamp 3136b9fc761eSTahsin Erdogan while (name_len--) { 3137ac27a0ecSDave Kleikamp hash = (hash << NAME_HASH_SHIFT) ^ 3138ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3139ac27a0ecSDave Kleikamp *name++; 3140ac27a0ecSDave Kleikamp } 3141b9fc761eSTahsin Erdogan while (value_count--) { 3142ac27a0ecSDave Kleikamp hash = (hash << VALUE_HASH_SHIFT) ^ 3143ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3144ac27a0ecSDave Kleikamp le32_to_cpu(*value++); 3145ac27a0ecSDave Kleikamp } 3146b9fc761eSTahsin Erdogan return cpu_to_le32(hash); 3147ac27a0ecSDave Kleikamp } 3148ac27a0ecSDave Kleikamp 3149f3bbac32SLinus Torvalds /* 3150f3bbac32SLinus Torvalds * ext4_xattr_hash_entry_signed() 3151f3bbac32SLinus Torvalds * 3152f3bbac32SLinus Torvalds * Compute the hash of an extended attribute incorrectly. 3153f3bbac32SLinus Torvalds */ 3154f3bbac32SLinus Torvalds static __le32 ext4_xattr_hash_entry_signed(char *name, size_t name_len, __le32 *value, size_t value_count) 3155f3bbac32SLinus Torvalds { 3156f3bbac32SLinus Torvalds __u32 hash = 0; 3157f3bbac32SLinus Torvalds 3158f3bbac32SLinus Torvalds while (name_len--) { 3159f3bbac32SLinus Torvalds hash = (hash << NAME_HASH_SHIFT) ^ 3160f3bbac32SLinus Torvalds (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^ 3161f3bbac32SLinus Torvalds (signed char)*name++; 3162f3bbac32SLinus Torvalds } 3163f3bbac32SLinus Torvalds while (value_count--) { 3164f3bbac32SLinus Torvalds hash = (hash << VALUE_HASH_SHIFT) ^ 3165f3bbac32SLinus Torvalds (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^ 3166f3bbac32SLinus Torvalds le32_to_cpu(*value++); 3167f3bbac32SLinus Torvalds } 3168f3bbac32SLinus Torvalds return cpu_to_le32(hash); 3169f3bbac32SLinus Torvalds } 3170f3bbac32SLinus Torvalds 3171ac27a0ecSDave Kleikamp #undef NAME_HASH_SHIFT 3172ac27a0ecSDave Kleikamp #undef VALUE_HASH_SHIFT 3173ac27a0ecSDave Kleikamp 3174ac27a0ecSDave Kleikamp #define BLOCK_HASH_SHIFT 16 3175ac27a0ecSDave Kleikamp 3176ac27a0ecSDave Kleikamp /* 3177617ba13bSMingming Cao * ext4_xattr_rehash() 3178ac27a0ecSDave Kleikamp * 3179ac27a0ecSDave Kleikamp * Re-compute the extended attribute hash value after an entry has changed. 3180ac27a0ecSDave Kleikamp */ 3181daf83281STahsin Erdogan static void ext4_xattr_rehash(struct ext4_xattr_header *header) 3182ac27a0ecSDave Kleikamp { 3183617ba13bSMingming Cao struct ext4_xattr_entry *here; 3184ac27a0ecSDave Kleikamp __u32 hash = 0; 3185ac27a0ecSDave Kleikamp 3186ac27a0ecSDave Kleikamp here = ENTRY(header+1); 3187ac27a0ecSDave Kleikamp while (!IS_LAST_ENTRY(here)) { 3188ac27a0ecSDave Kleikamp if (!here->e_hash) { 3189ac27a0ecSDave Kleikamp /* Block is not shared if an entry's hash value == 0 */ 3190ac27a0ecSDave Kleikamp hash = 0; 3191ac27a0ecSDave Kleikamp break; 3192ac27a0ecSDave Kleikamp } 3193ac27a0ecSDave Kleikamp hash = (hash << BLOCK_HASH_SHIFT) ^ 3194ac27a0ecSDave Kleikamp (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^ 3195ac27a0ecSDave Kleikamp le32_to_cpu(here->e_hash); 3196617ba13bSMingming Cao here = EXT4_XATTR_NEXT(here); 3197ac27a0ecSDave Kleikamp } 3198ac27a0ecSDave Kleikamp header->h_hash = cpu_to_le32(hash); 3199ac27a0ecSDave Kleikamp } 3200ac27a0ecSDave Kleikamp 3201ac27a0ecSDave Kleikamp #undef BLOCK_HASH_SHIFT 3202ac27a0ecSDave Kleikamp 32039c191f70ST Makphaibulchoke #define HASH_BUCKET_BITS 10 32049c191f70ST Makphaibulchoke 32057a2508e1SJan Kara struct mb_cache * 320682939d79SJan Kara ext4_xattr_create_cache(void) 3207ac27a0ecSDave Kleikamp { 32087a2508e1SJan Kara return mb_cache_create(HASH_BUCKET_BITS); 3209ac27a0ecSDave Kleikamp } 3210ac27a0ecSDave Kleikamp 32117a2508e1SJan Kara void ext4_xattr_destroy_cache(struct mb_cache *cache) 3212ac27a0ecSDave Kleikamp { 32139c191f70ST Makphaibulchoke if (cache) 32147a2508e1SJan Kara mb_cache_destroy(cache); 3215ac27a0ecSDave Kleikamp } 32169c191f70ST Makphaibulchoke 3217